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The only orthogonals are the horizontal divider bands of the panelling on the receding right side wall (three bands; soft fresco edges). The back wall with the window is frontal (its horizontals are transversals); the window shows no receding reveal; the vault ribs and wall arches are curved; the painted frame, ledge and capitals are not part of the depicted room. Review run twice: in run 1 mark 0 (upper edge of the top band) snapped to the lower edge of that band; I re-aimed the mark at that lower edge and in run 2 it no longer snapped (13 of 27 stations). Mark 2 (lower edge of middle band) is unsnapped both times. Lines 1 and 3 lie on the edges meant; no rejects. Very few orthogonals in this picture.","B":"Worked with zoom from the start. The only straight depth edges are the rails of the painted panelling on the receding right wall, which show as thin light lines rising to the right. The vault ribs and the lunette arches are curved; the back wall (window, sill, mouldings) and the painted frame, cornice and capitals are frontal, so none of them is marked. Review run three times. In the first draft I marked both edges of each rail (6 marks), but the rails are only about 5-12 px wide, both marks of a pair snapped to the same edge, and two did not snap. So I re-marked one line per visible rail edge and deleted the duplicate marks, then added the upper edge of the lowest rail (line 4). Rejects: 2 (lower line of the middle rail) snapped onto line 1's edge, and 4 snapped onto line 3's edge. The picture has few orthogonals, all on one wall and all short, so it carries little weight."}},{"id":"duccio-last-supper","artist":"Duccio","title":"Last Supper (Maest\u00e0, back)","short":"Duccio","date_label":"1308\u201311","year":1309.5,"region":"italy","medium":"tempera and gold on panel","place":"Museo dell'Opera del Duomo, Siena","img":"img/duccio-last-supper.jpg","W":1256,"H":1107,"scale":1.0,"lines":{"A":[[32.828,62.827,128.085,130.762],[1215.782,55.97,1119.469,132.473],[377.697,50.46,452.245,132.7],[887.766,55.574,823.557,134.828],[1197.707,131.273,1156.114,165.712],[153.152,576.056,15.039,764.949],[188.619,570.712,162.134,607.093],[72.378,567.348,11.433,652.851],[1198.122,560.995,1190.448,577.277],[90.289,645.127,18.584,745.063]],"B":[[32.242,62.373,139.693,139.042],[377.573,50.237,454.029,134.795],[889.536,53.608,821.289,137.312],[1219.788,52.737,1116.467,134.887],[1152.683,168.612,1198.833,130.27],[67.363,574.712,18.316,642.906],[125.696,613.658,14.084,766.183],[118.219,643.186,22.876,774.158],[1198.045,561.463,1182.248,593.811],[1238.856,622.444,1204.398,671.562]]},"groups":{"A":["ceiling","ceiling","ceiling","ceiling","right-wall","furniture","furniture","furniture","furniture","furniture"],"B":["ceiling","ceiling","ceiling","ceiling","right-wall","furniture","furniture","furniture","furniture","furniture"]},"sigma":{"A":[0.2604,0.2572,0.3198,0.2754,0.3711,0.2454,0.3912,0.2658,1.1636,0.2569],"B":[0.2553,0.2861,0.2752,0.2548,0.438,0.2958,0.2462,0.2668,0.4561,5.2202]},"tau":38.34987651005163,"tau95":[5.340722818557076,50.05019559224149],"rms":25.534816269141555,"rms95":[4.43781752153233,34.94793422966932],"vp":[554.2229029887844,324.3095136418887],"tauA":36.04490278516599,"tauB":44.40570967530445,"reader_gap":0.03238191029762009,"by_group":{"ceiling":{"n":8,"tau":7.372240762437455,"vp":[649.0833416379554,414.35691361778856]},"furniture":{"n":10,"tau":0.6922137577265715,"vp":[3413.363903106306,-3959.547686046594]},"right-wall":{"n":2,"tau":null,"vp":null}},"source":{"file":"File:Duccio di Buoninsegna 029.jpg","url":"https://commons.wikimedia.org/wiki/File:Duccio_di_Buoninsegna_029.jpg","license":"Public domain","credit":"Artist: Duccio di Buoninsegna; Credit: The Yorck Project (2002) 10.000 Meisterwerke der Malerei (DVD-ROM), distributed by DIRECTMEDIA Publishing GmbH. ISBN: 3936122202."},"true_vp":null,"edges":12,"measurable":true,"share1":0.5746812183375547,"share1_95":[0.45520680477533754,0.8888971461949872],"share05":0.5746812183375547,"share2":0.5746812183375547,"share1_flat":0.5462319028845086,"share1_A":0.5901165264307712,"share1_B":0.5598907992343952,"vp1":[-2860.9023202620674,4682.60384089536],"points":[{"cum_share":0.5746812183375547,"vp":[-2860.9023202620674,4682.60384089536]},{"cum_share":0.8250356761746405,"vp":[1075.5658297999778,814.3094694891879]},{"cum_share":1.0,"vp":[2950.5850571162905,-1322.7366218746772]}],"notes":{"A":"Worked with zoom from the start. Orthogonals: both side cornices (upper and lower edge of each orange moulding), both ceiling beams/brackets running back (outer edge; inner groove of left beam), the lintel of the door in the right side wall, and the woven stripes of the tablecloth at both table ends (read as stripes on the table top running into depth; the table is shown square). Rejects: 1, 3 and 5 each settled on the other (stronger) edge of the same moulding/beam, duplicating 0, 2 and 4; 14 settled on the knife handle, not the cloth stripe. Review run three times: after run 1, mark 12 was moved onto a stripe (it lay between stripes), marks 13-15 added, and an unsure mark on the right beam's inner groove was removed because it snapped onto the outer edge (same as 6); after run 2, 12 was re-aimed at the stripe edge the snap had found and 15 re-aimed at the thin stripe line (it had duplicated 8). 12 and 13 end unsnapped. Not marked: the dark left side wall shows no clear edge; table front/back, rail and back-wall mouldings are transversals; floor/step at bottom is transversal.","B":"Worked with zoom from the start. The orthogonals depicted are: the two red ceiling-edge mouldings where the ceiling meets the left and right walls; the two beams that run from the front to the back wall; the top of the door in the right wall; and, on the long table, which is set parallel to the picture, the edges of the table top and cloth border stripes at its left and right ends, all running into depth. The rod, the back-wall frieze and cornice, the doorways, the table front and the bench are transversals and are not marked. The table-end stripes are drawn nearly parallel rather than converging, but I marked them for what they depict. Unsure: the bottom of the right-wall door, which is partly hidden by a halo. Review run twice. After the first run I re-marked 1 and 7 (the lower edges of the two ceiling mouldings) more precisely, but both still snapped onto the upper edge of their moulding (lines 0 and 6), so they are rejected. Other rejects: 3 and 5 (inner lines of the beams) snapped onto the outer beam edges, which are lines 2 and 4; 10 (thin cloth stripe) snapped onto the stripe edge that is line 11; 14 settled on the knife. 16 did not snap."}},{"id":"giotto-confirmation","artist":"Giotto","title":"Confirmation of the Rule","short":"Giotto","date_label":"1320s","year":1325,"region":"italy","medium":"fresco","place":"Bardi Chapel, Santa Croce, Florence","img":"img/giotto-confirmation.jpg","W":1157,"H":770,"scale":1.0,"lines":{"A":[[356.567,273.644,389.658,294.231],[405.773,309.686,428.501,324.268],[424.482,272.913,452.109,290.96],[466.332,302.453,488.934,317.226],[499.457,277.954,512.526,290.331],[526.675,301.49,537.221,312.465],[717.461,269.845,722.214,287.22],[725.241,298.791,727.364,310.608],[867.118,265.032,846.371,314.887]],"B":[[294.295,275.037,326.955,296.352],[359.072,274.509,384.015,291.214],[425.816,273.444,450.652,290.272],[499.751,278.365,515.202,292.588],[466.756,302.519,491.581,319.361],[532.241,303.513,548.56,316.754],[407.247,310.681,427.532,323.508],[717.482,269.731,722.092,287.136],[724.832,297.436,727.663,312.167],[867.389,264.165,846.75,314.064]]},"groups":{"A":["ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling"],"B":["ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","right-wall"]},"sigma":{"A":[0.9469,0.6902,0.618,1.1506,7.8777,8.9154,1.2192,7.8157,0.4315],"B":[8.427,0.8624,0.9798,0.7897,0.6997,18.4342,0.5558,0.9681,2.5222,0.3539]},"tau":1.9080868052642326,"tau95":[0.0,2.2270660370361623],"rms":2.7375774470841105,"rms95":[1.5422281438045866,3.3002370267914043],"vp":[770.3399320225898,518.1554105459606],"tauA":2.1021871002200365,"tauB":1.9594390045355845,"reader_gap":0.006825833021334752,"by_group":{"ceiling":{"n":18,"tau":1.892116434701037,"vp":[773.3188116726734,521.2821520361015]},"right-wall":{"n":1,"tau":null,"vp":null}},"source":{"file":"File:Giotto di Bondone - Scenes from the Life of Saint Francis - 5. Confirmation of the Rule - WGA09311.jpg","url":"https://commons.wikimedia.org/wiki/File:Giotto_di_Bondone_-_Scenes_from_the_Life_of_Saint_Francis_-_5._Confirmation_of_the_Rule_-_WGA09311.jpg","license":"Public domain","credit":"Artist: Giotto; Credit: Web Gallery of Art: Image Info about artworkwga QS:P11807,\"g/giotto/s_croce/2bardi/scenes_2/franci5\""},"true_vp":null,"edges":12,"measurable":true,"share1":0.731565273029215,"share1_95":[0.7112894096830242,1.0],"share05":0.731565273029215,"share2":0.8171950875365549,"share1_flat":0.48548717680982517,"share1_A":0.7287356419590627,"share1_B":0.7446261533936747,"vp1":[769.9306181342467,498.57308656273756],"points":[{"cum_share":0.731565273029215,"vp":[769.9306181342467,498.57308656273756]},{"cum_share":1.0,"vp":[817.5610688686868,570.7807423778479]}],"notes":{"A":"Worked with zoom from the start. Orthogonals: the joists of the flat ceiling of the hall seen from below (dark lines running back between the front entablature and the back), each marked as two segments where a transverse beam crosses it, plus the right edge of the ceiling where it meets the right wall. Much of the ceiling (x ~560-700, ~740-800 upper part) and the whole left part of the hall are plaster losses. Side porticoes, pediment, back wall panelling are frontal; the footstool is too hidden by the throne step to mark. Unsure: a faint near-vertical joist line at x~780. Rejects: 0 settled on a line about 6 px above the joist line at its left end (steeper than the joist); 1 settled on the transverse beam. Review run twice: after run 1, marks 0 and 1 were shortened/re-aimed (0 had snapped steeply, 1 was unsnapped) and 7 was shortened because it had snapped to the vertical edge of a plaster loss; in run 2, 7 lies on its joist line, 0 and 1 still missed. 3 was steeper than its joist as I marked it; the green lies on the joist line seen in plain zoom, so kept.","B":"Worked with zoom from the start. The only clearly depicted depth edges are the ribs of the loggia's coffered ceiling and its right-hand edge where the ceiling meets the right side wall. The middle of the ceiling (about x 550-660) is lost plaster, and so is the band below it. The two side porticos are drawn frontally with their pediments, the back-wall panelling and the step are transversals, and the throne and dais are curved, so none of them is marked. Review run twice. Mark 2 was moved once to keep it off the transverse beam, but it still snapped onto the beam and is rejected. 10 and 11 (faint ribs near the right edge) snapped onto the stronger ceiling/wall edge, which is line 12, so they are rejected. A faint rib near x 778 was left out as too faint."}},{"id":"pietro-lorenzetti-birth","artist":"Pietro Lorenzetti","title":"Birth of the Virgin","short":"P. 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Worked with zoom from the start; two review runs. Marked: the cornice of the left side wall in the centre panel (top edge and lower edge), the receding ledge and frieze on the right side wall of the right panel, the cornice and string course of the corridor's left wall in the left panel (string course in two pieces either side of the pilaster), the cornice and gallery rail on the side face of the Gothic building behind the balcony, and a short string course inside the far arch (left panel). Not marked: vault ribs (curved), the plaid coverlets (diagonal pattern on draped cloth), the bed and chest (their faces are frontal; receding sides hidden), the balcony (frontal). Review 1 -> 2: removed a third centre-panel cornice mark that snapped onto the same lower edge as line 1 (duplicate); replaced two right-panel marks that snapped onto a horizontal ledge under the back-wall window (that stretch is back wall, not side wall) with two short marks on the side-wall part right of x=1760; dropped an unsure mark on the right-panel table edge, which the paint shows is a vertical edge. Rejects: 2 (meant the ledge top, settled on its lower edge), 3 (meant the frieze's upper edge, settled on the ledge 20 px below).","B":"Photograph of the whole triptych in its frame (slightly dark, some glare strips); usable. Worked with zoom from the start; one review run. Few orthogonals are clearly depicted: the receding left-wall cornice of the centre room (top and bottom edges of the grey band), the left panel's side-wall cornice, the side-wall string course and the top of the side-wall door, the joints of the bed platform's top boards (three), and the far edge of the sideboard behind the right-hand women. Rejected 2: meant for the thin lower molding under the cornice band, it settled on the same band edge as line 1. Unsure: the short receding cornice at the far right of the right panel (cannot tell whether that wall runs into depth) and the top of the small box behind Anne's pillow (may be set at an angle). Not marked: vault ribs (curved), the bed's plaid coverlet (cloth), the chequered floor (patterned, broken by figures), frontal balconies and arcades."}},{"id":"ambrogio-lorenzetti-annunciation","artist":"Ambrogio Lorenzetti","title":"Annunciation","short":"A. 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I redid the whole selection with `zoom` at 4x. Only the pavement carries orthogonals. Marked: the side joints of the checker tiles (the black/pink boundaries that run into depth), one mark per visible tile side. These cover every row of the visible patch between the angel's and the Virgin's robes, either side of the twisted column (0-4, 9-13, 17-19), and the front rows (5-8, 14-16). Review was run twice in round 2. The first run crashed on a missing temp file before writing anything; with the zoom views in hand, I corrected marks before the successful run. Two marks from round 1 were dropped: the round-1 mark at x~1042, y 1742-1808 is on the edge of a quatrefoil, not a joint, and the old left-edge mark in row y 1690-1735 was the red robe's edge. Every green line was checked in zoom A and lies on a tile joint, so nothing is rejected. Round-1 rejects 3 and 5 (the hem and the column edge) no longer arise. Unsure (1): the long black diagonal in the front row at x 1757-1847. It may be a joint running into depth, or just a diagonal of the hourglass inlay; it snapped. Not marked: the lectern/seat (not square to the picture); the arcade and the frame (no depth edges); the triangular inlays in the front row (pattern diagonals).","B":"Round 2 (zoom, new snap parameters); two review runs in round 2. Only the checkered floor offers orthogonals. At 4x it became clear that my round-1 marks were read wrong: the column joints in the far floor are not near-vertical but lean (left of the lectern column to the left, right of it to the right), and in the near rows under the figures they lean steeply. All marks were rebuilt: 0-2 long column joints through the far floor (x 1010-1262, y 1547-1790), 3-6 joints in the rows below the angel's palm/robe (split per row where tiles do not line up), 7-8 tile sides under the Virgin's robe hem, 9-10 near-row tile sides at bottom left, 11-14 near-row tile sides at bottom right. Only side edges of tiles were marked, never the X diagonals inside the pink tiles or quatrefoil outlines. Reject rebuilt in zoom: none; every green line lies on the tile side meant. 7 unsnapped (my mark lay on the quatrefoil outline, not the tile side). Round-1 rejects 2 and 3 no longer apply (marks replaced)."}},{"id":"fra-angelico-annunciation-prado","artist":"Fra Angelico","title":"Annunciation (Prado)","short":"Fra Angelico","date_label":"c. 1425\u201326","year":1425.5,"region":"italy","medium":"tempera and gold on panel","place":"Museo del Prado, Madrid","img":"img/fra-angelico-annunciation-prado.jpg","W":1600,"H":1280,"scale":0.8333333333333334,"lines":{"A":[[1099.71,420.169,1187.667,389.97],[584.585,395.94,628.16,407.403],[500.934,1428.981,464.023,1511.064],[617.144,1465.645,605.839,1499.812],[1160.151,1463.947,1171.174,1501.357],[1277.775,1461.234,1293.281,1490.364]],"B":[[1102.5,419.267,1198.902,385.946],[1099.712,423.326,1190.267,391.456],[1262.366,817.6,1361.522,904.733],[1272.764,856.245,1354.316,931.546],[1339.827,819.782,1397.945,862.284],[500.329,1430.154,466.049,1506.841]]},"groups":{"A":["ceiling","ceiling","floor","floor","floor","floor"],"B":["ceiling","ceiling","furniture","furniture","furniture","floor"]},"sigma":{"A":[0.4997,0.7323,0.2762,0.7836,0.5296,1.0549],"B":[0.3704,0.4031,0.2561,0.2667,0.5273,0.3044]},"tau":2.25494165978073,"tau95":[0.677724662751872,3.4880925533691554],"rms":1.602071950190955,"rms95":[0.6594420362933092,2.581977304354248],"vp":[894.3136306944538,491.5833788652844],"tauA":3.568225285264357,"tauB":0.7589334823141862,"reader_gap":0.0070102473281817975,"by_group":{"ceiling":{"n":4,"tau":0.40893867141470286,"vp":[918.8595291871688,484.0905375680432]},"floor":{"n":5,"tau":1.933120109401333,"vp":[876.7124126778226,617.4015368988152]},"furniture":{"n":3,"tau":null,"vp":null}},"source":{"file":"File:La Anunciaci\u00f3n (Fra Angelico-Prado).jpg","url":"https://commons.wikimedia.org/wiki/File:La_Anunciaci%C3%B3n_(Fra_Angelico-Prado).jpg","license":"Public domain","credit":"Artist: Fra Angelico; Credit: Prado"},"true_vp":null,"edges":9,"measurable":true,"share1":0.7813106828964794,"share1_95":[0.6727017045702252,0.9751111309308395],"share05":0.585226612012155,"share2":0.9163409486259141,"share1_flat":0.6912825059582292,"share1_A":0.7857417140125591,"share1_B":1.0,"vp1":[895.4827694817964,495.20260070250293],"points":[{"cum_share":0.7813106828964794,"vp":[895.4827694817964,495.20260070250293]},{"cum_share":0.9646319383549615,"vp":[929.772292911705,486.6383920924901]}],"notes":{"A":"Worked with zoom (4x) from the start; one review run. Very few orthogonals: the loggia has no tiled floor, no coffers and no visible side-wall edges; the vaults are curved and the long tie rod at y~370 runs across the picture. Marked: the two short iron tie rods that run from the front columns back to the rear wall (both edges each), the left edge of the loggia platform at bottom left, the receding edges of the two column plinths, and the sill/reveal of the small back-wall window. Rejected: 0 and 2 (meant the upper edge of a tie rod, green took the lower edge, already marked by 1 and 3), 9 (meant the sloping window reveal, green took a horizontal edge). 5 unsnapped. Unsure: the long edges of the bench in the back room (cannot tell whether the bench is set square to the picture plane). This picture contributes little.","B":"Worked with zoom from the start; review run twice. Few straight orthogonals: the loggia's vaults are curved and its floor is unpatterned. Marked: the tie rod crossing the left bay (0) and both edges of the tie rod crossing into the right bay from the middle capital (1, 2); the bench in the inner room, which runs into depth (3 seat front edge, 4 lower edge of seat apron, 5 far long edge of seat against the wall); the left receding edge of the loggia's raised floor slab (6). Unsure: the receding right edge of the middle column's plinth (short, ~35 px; not sure whether the snapped outer boundary is the top or a lower edge of the plinth). Changes after review 1: 0 moved onto the rod's upper edge (first mark had snapped to the capital); 4 moved ~8 px down (it had snapped onto the same edge as 3); 7 moved to unsure; a mark on the plinth's left edge was dropped because I could not tell what that edge depicts. Reject: 0, whose green line is not parallel to the rod and sits partly on the capital below it. Not marked: window-reveal and door-rebate edges of the inner room (under ~20 px), Eden, the light ray."}},{"id":"masaccio-trinity","artist":"Masaccio","title":"Holy Trinity","short":"Masaccio","date_label":"c. 1426\u201328","year":1427,"region":"italy","medium":"fresco","place":"Santa Maria Novella, Florence","img":"img/masaccio-trinity.jpg","W":992,"H":1600,"scale":0.6666666666666666,"lines":{"A":[[567.195,643.994,571.366,685.787],[574.543,715.96,580.495,769.631],[583.158,800.7,589.14,851.35],[591.411,874.056,596.259,915.775],[623.85,604.293,628.668,636.941],[629.606,699.03,629.883,732.027],[610.199,704.143,614.248,751.972],[615.953,782.121,618.808,830.036],[641.713,850.881,641.431,874.888],[866.835,601.029,864.201,633.923],[777.17,579.927,776.008,627.913],[877.204,604.986,873.082,658.828],[764.683,675.002,764.228,732.0],[878.59,692.959,875.172,740.838],[766.642,770.002,766.621,797.166],[864.535,779.002,863.158,808.971],[766.226,845.019,768.231,865.931],[920.723,620.021,916.728,673.872],[913.596,709.98,909.375,760.805],[906.122,791.989,901.754,842.801],[898.745,872.925,895.661,929.844],[920.819,880.033,922.843,909.964],[1029.332,874.027,1026.508,897.869],[725.633,687.001,726.451,728.993],[720.248,778.999,719.987,799.995],[722.716,852.992,723.727,876.975]],"B":[[629.785,696.975,629.703,729.975],[725.648,688.001,726.549,732.992],[720.201,775.857,719.765,811.893],[641.335,855.015,640.769,875.999],[722.81,854.996,723.621,875.98],[792.431,587.986,788.779,632.836],[866.753,600.04,864.047,638.947],[764.777,682.004,764.126,733.0],[878.614,694.006,875.672,732.895],[766.598,763.089,766.647,796.21],[864.386,777.996,863.064,819.978],[764.263,850.998,763.331,877.984],[866.908,854.008,866.569,875.01],[567.984,652.077,571.585,687.896],[574.104,711.566,580.311,768.227],[583.126,799.469,587.858,841.202],[591.02,871.879,596.096,913.571],[920.544,621.838,916.135,681.675],[913.81,707.79,909.581,758.614],[905.973,793.046,901.06,852.855]]},"groups":{"A":["ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling"],"B":["ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling"]},"sigma":{"A":[0.3711,0.33,0.3473,0.4252,2.2588,0.5116,0.4002,5.4241,3.1585,0.5564,0.461,0.339,0.3351,0.3601,5.4437,0.8944,7.0401,0.3291,0.3386,0.5472,1.1536,5.39,4.1974,0.3841,2.9977,5.3742],"B":[0.6309,0.3724,2.0475,4.993,0.6334,0.4101,0.4082,0.4053,0.4049,2.4663,0.6357,4.5909,0.9788,0.5682,0.3498,0.3993,0.4136,0.3251,0.3396,0.4067]},"tau":1.310945035253027,"tau95":[0.38080427256945515,1.8055584502523332],"rms":2.0795368938587093,"rms95":[1.2812429788450266,2.7663534168983173],"vp":[756.2942097934524,2586.0154837583095],"tauA":1.1037382834860692,"tauB":1.5648798803242556,"reader_gap":0.058223974764160975,"by_group":{"ceiling":{"n":46,"tau":1.310945035253027,"vp":[756.2942097934524,2586.0154837583095]}},"source":{"file":"File:Masaccio, Holy Trinity, 1425-28, Santa Maria Novella, Florence.jpg","url":"https://commons.wikimedia.org/wiki/File:Masaccio,_Holy_Trinity,_1425-28,_Santa_Maria_Novella,_Florence.jpg","license":"Public domain","credit":"Artist: Masaccio; Credit: Own work MenkinAlRire Taken on 13 September 2021"},"true_vp":null,"edges":29,"measurable":true,"share1":0.9285846879725557,"share1_95":[0.8235212608242135,1.0],"share05":0.8880071125829211,"share2":0.93994865306155,"share1_flat":0.7029468384533064,"share1_A":0.9684889609965746,"share1_B":0.9026441500106976,"vp1":[759.2541790931225,2568.407635060894],"points":[{"cum_share":0.9285846879725557,"vp":[759.2541790931225,2568.407635060894]},{"cum_share":0.9886360349110057,"vp":[635.0856599615745,2520.3313202145]}],"notes":{"A":"Round 2 (after the addendum). I redid the whole selection with `zoom`. Marked: the longitudinal (depth-running) side edges of the barrel-vault coffers, across every coffer column I could read. That covers the far-left column (0-3); the left column L1-L4 (panel edges 4-7, 9, 10, 12, 13, frame edges 8, 11, and frame right edges 34-36, added in pass 2); the centre column C1-C4 (14-24); the right column R1-R5 (25-31); and the far-right column (32, 33). Each coffer side is a separate mark because the transverse ribs break it. Coffer sides carry two kinds of longitudinal edge, the dark panel edge and the painted frame lines around it, and I marked whichever I could read. With the wider search, several panel-edge marks snapped onto the neighbouring frame line (8-20 px away) or duplicated another mark. I rejected those as not the edge I meant: 7, 10, 13 (frame right edge, now marked properly as 34-36), 9 (inner frame line; 9 was also corrected once, onto the panel edge, and still went to the frame), 14 (duplicate of 16), 18 (duplicate of 20), 19 (duplicate of 21), 27 and 29 (inner frame line instead of the panel end). 32: I could not confirm in zoom that the green lies on the coffer side, so it is rejected. 5 did not snap. Review was run 3 times in round 2: pass 1 with 34 marks; pass 2 corrected 9 and added 34-36; pass 3 was an identical rerun to redraw review images that a broken pipe had cut short. Coffers hidden by God the Father's halo, and those under the front arch, were not marked. Unsure: the two diagonal returns at the ends of the top cornice (return edge or just the molding profile?). Round 1 (for the record): 18 marks, 7 snapped, before the snap change.","B":"Round 2 (zoom, new snap parameters). All marks rebuilt from 4x zoom views. Lines are all coffer edges running into depth: 0-15 the side edges of the 4 rows of coffers in the two central coffer columns (short, one per coffer side); 16-19 the same four edges as long marks through all rows (none snapped: the edge is broken by each transverse rib); 20-23 a longitudinal rib edge in the next coffer column to the left, 24-26 its counterpart on the right. The four cornice/entablature return edges marked in round 1 were moved to unsure: at 4x the diagonal looks like the silhouette of the stepped moulding profile, not clearly a straight edge running into depth. Review: round 2 used two review runs (the second only re-placed marks 0, 1, 4). Reject rebuilt from scratch in zoom view: 0 (green tilted about 8 degrees against a near-vertical coffer edge, sits partly on shading left of it) and 4 (settled on a slanting shadow left of the coffer, not its side). Note for the analyst: greens 3, 5, 7, 10, 11, 14, 15 landed not on the inner edge of the coffer panel but 10-18 px away on the outer edge of the same coffer's moulded frame, which is also a straight longitudinal edge of that coffer; I accepted these as the side edge meant, and say so here so they can be dropped in a sensitivity run if wanted. Not marked: coffers further out on the curved sides of the vault (edges too soft to place even at 4x), the back chapel, the step and ledge (transversals only). 1 is unsnapped."}},{"id":"campin-merode","artist":"Workshop of Robert Campin","title":"M\u00e9rode Altarpiece, central panel","short":"Campin wkshp","date_label":"c. 1427\u201332","year":1429.5,"region":"north","medium":"oil on oak","place":"The Met Cloisters, New York","img":"img/campin-merode.jpg","W":1531,"H":1600,"scale":0.8221993833504625,"lines":{"A":[[260.786,206.184,299.68,228.829],[394.541,179.593,435.872,209.467],[344.526,206.617,374.668,226.301],[457.395,201.842,484.173,225.903],[587.83,193.965,607.518,227.63],[609.431,196.241,623.771,225.963],[730.836,196.024,732.814,228.965],[755.283,192.981,754.408,228.972],[889.751,194.808,865.934,225.693],[924.474,194.609,904.737,217.202],[1032.067,198.174,992.291,225.042],[1059.505,196.667,1029.338,216.312],[1200.983,199.946,1141.358,228.249],[1256.755,192.419,1207.021,213.456],[1336.216,192.453,1271.511,216.419],[548.804,267.801,566.098,284.439],[628.759,268.745,639.678,290.117],[866.741,263.736,848.391,283.81],[1253.881,264.756,1282.735,256.12],[222.017,183.988,259.008,203.88],[222.047,203.639,253.619,220.975],[184.765,249.473,222.359,268.197],[150.93,307.704,187.451,321.385],[370.849,268.275,389.334,278.239],[1645.201,200.749,1696.796,184.812],[1637.117,217.418,1700.59,199.328],[1657.263,241.495,1723.944,223.758],[1682.794,264.728,1743.861,249.243],[1697.051,285.062,1749.29,271.383],[1721.978,322.89,1748.392,317.299],[1351.167,267.212,1395.01,257.073],[1294.298,387.021,1682.185,293.509],[1605.949,331.781,1673.123,316.015],[1170.0,808.365,1427.826,1019.113],[1212.272,869.813,1363.487,1002.27]],"B":[[432.399,266.8,459.051,286.264],[457.381,201.831,486.403,227.884],[588.254,194.852,606.514,225.877],[608.086,193.776,623.861,226.134],[477.497,252.519,496.963,266.556],[527.419,265.577,547.366,283.772],[730.755,194.004,732.857,229.942],[755.101,193.996,754.424,229.99],[735.254,263.989,736.265,284.964],[888.762,195.792,866.975,224.451],[924.491,194.564,904.766,217.168],[840.367,262.671,826.786,282.457],[865.95,264.552,853.958,277.976],[1050.897,268.853,1009.963,287.52],[1210.347,195.693,1142.475,227.604],[1256.936,192.358,1204.415,214.508],[1309.692,202.221,1242.214,227.333],[1212.433,255.941,1178.346,267.517],[1434.911,172.666,1366.804,196.036],[222.477,184.109,259.395,204.135],[222.813,204.031,254.359,221.375],[184.435,249.224,221.997,268.014],[148.899,307.038,185.461,320.612],[370.054,267.846,391.216,279.167],[372.931,278.694,393.865,290.434],[349.048,321.893,367.843,331.274],[1637.117,217.418,1700.59,199.328],[1655.313,242.06,1721.95,224.156],[1677.397,262.414,1741.234,245.657],[1678.963,293.847,1745.973,277.391],[1695.339,285.624,1747.55,271.839],[1722.495,325.413,1748.965,320.09],[1294.838,386.931,1688.534,291.91],[1303.246,401.082,1686.273,313.108],[1257.993,522.195,1326.907,518.734],[1675.011,556.25,1728.976,558.222],[1129.481,300.162,1101.46,317.582],[1173.637,811.268,1433.718,1023.998],[1598.832,1159.197,1667.557,1217.306]]},"groups":{"A":["ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","left-wall","left-wall","left-wall","left-wall","left-wall","right-wall","right-wall","right-wall","right-wall","right-wall","right-wall","right-wall","right-wall","right-wall","furniture","furniture"],"B":["ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","left-wall","left-wall","left-wall","left-wall","left-wall","left-wall","left-wall","right-wall","right-wall","right-wall","right-wall","right-wall","right-wall","right-wall","right-wall","right-wall","right-wall","back-structure","furniture","furniture"]},"sigma":{"A":[0.9536,0.3835,0.4763,0.4123,0.4661,0.568,0.4398,0.4559,0.7515,0.6723,0.3827,0.4472,0.3234,0.3646,0.3608,0.6792,0.9016,1.3012,4.0915,0.5611,0.5925,0.4824,0.5881,1.1738,0.3385,0.2982,0.2997,0.3091,0.3235,0.6766,0.4779,0.2401,0.2935,0.2411,0.2481],"B":[0.4475,0.4522,0.4605,0.4761,0.7853,1.0982,0.4281,0.5171,2.6076,0.5151,0.6462,1.3505,1.3736,0.6322,0.3061,0.3727,0.3313,0.7541,0.3072,0.6276,0.6126,0.475,0.5701,0.9967,1.1469,1.1177,0.2984,0.3222,0.3229,0.3005,0.3477,0.6888,0.24,0.2402,0.375,0.3449,4.4694,0.2407,0.378]},"tau":4.063363788509388,"tau95":[3.330115967419088,4.5361602773566],"rms":3.9594272568760895,"rms95":[3.016282329392946,4.476504629300624],"vp":[725.2350821893195,453.01081269627286],"tauA":3.6952876061241255,"tauB":4.406513018584546,"reader_gap":0.010143813467204707,"by_group":{"back-structure":{"n":1,"tau":null,"vp":null},"ceiling":{"n":38,"tau":2.937525494813113,"vp":[726.7802606721926,432.16264248201696]},"furniture":{"n":4,"tau":0.45519690940279545,"vp":[689.3954042916338,411.9011887943128]},"left-wall":{"n":12,"tau":0.8639987651961862,"vp":[1141.373334880272,698.5562375469331]},"right-wall":{"n":19,"tau":1.7261602770303677,"vp":[424.48566276083864,576.5436815846501]}},"source":{"file":"File:Robert Campin - Triptych with the Annunciation, known as the \"Merode Altarpiece\" - Google Art Project.jpg","url":"https://commons.wikimedia.org/wiki/File:Robert_Campin_-_Triptych_with_the_Annunciation,_known_as_the_%22Merode_Altarpiece%22_-_Google_Art_Project.jpg","license":"Public domain","credit":"Artist: Workshop of Robert Campin; Credit: From Google Art Project, artwork page, maximum resolution"},"true_vp":null,"edges":50,"measurable":true,"share1":0.6175060000645981,"share1_95":[0.4807505834606658,0.7837521118449776],"share05":0.5811123191864955,"share2":0.7272839765774284,"share1_flat":0.5739532648859939,"share1_A":0.5983714046371394,"share1_B":0.6338491912726776,"vp1":[802.3775772152319,505.6134317531891],"points":[{"cum_share":0.6175060000645981,"vp":[802.3775772152319,505.6134317531891]},{"cum_share":0.8371220429588241,"vp":[719.0638819220829,418.3650728823103]},{"cum_share":0.9451105659128258,"vp":[746.2780253950859,486.65172299781096]}],"notes":{"A":"Worked with zoom from the start. Orthogonals: edges of the ceiling joists in both bays (front beam - transverse beam - back wall), the joists/plates along the side walls, the moulding edges of the corbels on the left wall (two) and right wall (the large one and the small one by the hood), the cornice of the fireplace hood (the fireplace stands on the right wall; its cornice runs back along it), and the top rail of the settle's backrest (the settle is shown set square: its far end is frontal). Not marked: niche and window are frontal (the one embrasure diagonal at the window's top right did not snap; dropped), shutters and footboard are at an angle, table is round, most of the bench is hidden by Mary. Unsure: six floor-tile joints near the bench (faint; tile pattern includes octagonal/diamond tiles, so not sure the joints are square to the picture) and the top edges of the two fireplace impost blocks (nearly horizontal; could be frontal faces). Review run three times. After run 1 (55 marks) I deleted marks that snapped onto the transverse beams or the back-wall line or duplicated a neighbour's edge (15 deleted), and re-aimed 8 marks onto the orthogonal edge the snap had actually found (a joist or moulding edge next to the one I first pointed at). Because the snap seed follows the index, renumbering moved some results; run 3 re-aimed 6 of those. Final rejects: 4 (settled on a shadow at a different angle from the joist), 16 (upper moulding of the right wall plate, not the lower edge meant), 19 (right edge of the bay-2 vertical joist; the mark was for its left edge), 21 (the line where a joist meets the back wall), 22 (other edge of the joist from the one marked).","B":"Worked with zoom from the start (4x). Space read as: ceiling of two transverse beams with joists running into depth between and behind them; fireplace (hood cornice, capitals) and the large corbel on the right wall, the moulded corbels on the steeply receding left wall, the soffit/right-reveal corner of the back-wall window, and Mary's settle, which is drawn with a frontal far end and so taken as set square (back top rail, near top board). Not marked: the octagonal table and trestle, the open shutters (set at unknown angles), the footstool (askew), the dark floor (joints too faint to read as orthogonals), the niche and towel rail (no depth edges clear). Unsure: the sill/right-reveal corner at the window foot, which may be the shutter's bottom edge. Review run twice. After the first run I corrected marks 13, 22, 23, 33, 35, 36, 38, 39, 42, 44, 53, 54 (several moved onto the neighbouring fillet or joist edge that the zoom shows clearly). Rejects: ceiling joist marks whose snap took the other side of the joist or the lit-face edge instead of the dark edge meant (0, 1, 3, 8, 10, 19), the neighbouring joist's edge (20), nothing (18, 28), or the horizontal wall/ceiling junction (22, 23); left corbel marks settled on the next fillet (33, 37); capital marks settled on the moulding below the block (48, 49); 53 (lower edge of the settle's top rail) snapped onto the rail's top edge, which is line 52; 56 settled on the carved lion. Many ceiling joists are short (25-40 px), so each carries little weight."}},{"id":"van-eyck-arnolfini","artist":"Jan van Eyck","title":"Arnolfini Portrait","short":"van Eyck","date_label":"1434","year":1434,"region":"north","medium":"oil on oak","place":"National Gallery, London","img":"img/van-eyck-arnolfini.jpg","W":1169,"H":1600,"scale":0.6666666666666666,"lines":{"A":[[106.945,2054.336,193.936,1932.136],[390.046,1880.03,271.603,2099.055],[233.61,2171.268,116.435,2387.569],[442.576,2160.891,362.598,2390.353],[709.37,1834.873,686.881,1967.993],[642.099,2233.451,612.024,2392.634],[861.751,1779.999,860.905,1995.997],[1087.307,2279.92,1105.79,2392.412],[1683.737,2163.787,1733.04,2239.081],[1571.318,2339.303,1595.907,2387.38],[1053.814,9.587,1032.623,65.72],[1141.476,8.948,1113.966,65.624],[1226.606,13.48,1190.422,65.052],[965.229,9.999,951.346,65.284],[526.53,11.337,553.412,61.6],[612.689,10.385,633.846,63.313],[124.818,287.303,192.39,326.265]],"B":[[107.698,2052.936,182.73,1948.002],[294.249,2056.16,371.796,1913.927],[362.657,2390.267,440.62,2166.457],[116.597,2387.254,226.671,2184.166],[861.496,1812.0,861.21,1904.999],[705.634,1842.926,696.108,1899.125],[1086.63,2291.327,1103.541,2394.956],[98.439,231.573,198.412,292.354],[75.786,1315.252,183.77,1317.051],[148.356,1107.955,200.406,1093.574],[230.819,2176.868,286.026,2066.954],[611.92,2391.913,629.158,2303.579],[861.631,1912.004,860.534,1998.997],[1054.655,7.478,1033.413,63.592],[1141.414,9.194,1113.81,65.824],[1229.57,9.16,1193.442,60.772],[612.239,9.225,632.342,59.343],[82.551,262.994,196.977,328.802]]},"groups":{"A":["floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","left-wall"],"B":["floor","floor","floor","floor","floor","floor","floor","left-wall","furniture","left-wall","floor","floor","floor","ceiling","ceiling","ceiling","ceiling","left-wall"]},"sigma":{"A":[0.2604,0.243,0.2428,0.2439,0.2687,0.2499,0.2443,0.2626,0.2879,0.3377,0.3204,0.3313,0.3089,0.4284,0.3622,0.3355,0.3168],"B":[0.607,0.2494,0.2467,0.2435,0.324,0.3673,0.2849,0.4429,0.2621,0.3692,0.2727,0.2721,0.2836,0.3204,0.3129,0.3171,0.344,0.2652]},"tau":7.984796733213544,"tau95":[3.3487491207103943,10.986331509070146],"rms":6.8487868467148605,"rms95":[2.905595359803688,9.756098560955326],"vp":[864.9587293046844,819.5466526455901],"tauA":4.286745340903018,"tauB":9.72225323513603,"reader_gap":0.0645058857485446,"by_group":{"ceiling":{"n":10,"tau":1.1930729817009054,"vp":[838.5279573252532,586.1579957285072]},"floor":{"n":20,"tau":0.5847412440266098,"vp":[869.6982568153535,968.2971863189491]},"furniture":{"n":1,"tau":null,"vp":null},"left-wall":{"n":4,"tau":0.0,"vp":[1097.4555742427872,845.8604637124306]}},"source":{"file":"File:The Arnolfini portrait (1434).jpg","url":"https://commons.wikimedia.org/wiki/File:The_Arnolfini_portrait_(1434).jpg","license":"Public domain","credit":"Artist: Jan van Eyck; Credit: Gennadii Saus i Segura"},"true_vp":null,"edges":21,"measurable":true,"share1":0.702144089609046,"share1_95":[0.4999993845542848,0.8667339940786338],"share05":0.6326672644111015,"share2":0.7457507781782062,"share1_flat":0.6881010808321448,"share1_A":0.7922639770642934,"share1_B":0.606107461451799,"vp1":[872.5979460833321,973.1488647300873],"points":[{"cum_share":0.7021440896090458,"vp":[872.5979460833321,973.1488647300873]},{"cum_share":0.8573546476030771,"vp":[807.3620307596238,675.0289368919845]},{"cum_share":0.929786051459865,"vp":[834.6970121568087,573.5571958855918]}],"notes":{"A":"Round 2 (after the addendum). I redid the whole selection with `zoom` at 4x. Floor (0-11): floorboard joints on the left of the floor, between the shoes and the robes, in front of and behind the dog, the central joint above the dog, and two joints at the right front corner. Joints broken by the clogs, the robe or the dog are marked as separate segments. Ceiling (12-22): the edges of the joists visible in the band above the back wall (y 0-67). They are short (about 60 px) and dark; I marked the sides I could read. Also kept from round 1: 23, the lit top of the window ledge in the left wall, and 24, the lower edge of the bed canopy's valance (did not snap). Review was run three times in round 2: pass 1 with 25 marks; pass 2 corrected mark 0 only (still unsnapped, a faint joint); pass 3 was an identical rerun to redraw review images that a broken pipe had cut short. Rejected: 4 settled on the left edge of the man's blue robe, not on the faint joint beside it; 16 settled on a tone boundary inside the joist, between the two joist edges I marked (15 and 16), not on the edge I meant. Unsnapped: 0, 15, 18, 21, 22, 24. Dropped from round 1: the transom top-edge mark (rejected then), and old floor marks superseded by better-placed ones. Not marked: the chest and window sill (direction unclear); the bed and chair (soft, curved edges); the shutters (at an angle).","B":"Round 2 (zoom, new snap parameters); three review runs used in round 2. Marks re-read in 4x zoom and rebuilt. Lines: floorboard joints 0-8, 13-15 (the long left joints split where shoes or a dark patch interrupt: 1, 2+13, 3, 4); left-wall window transom bar, top edge 10 and bottom edge 23; window sill 12; chest top-front edge 11; bed canopy fringe top 9 and bottom 24 (both unsnapped: ragged fringe); ceiling joist side edges 16-22 (short, only the 60 px strip of ceiling visible above the back wall). Changes from round 1: marks 2, 3, 4, 7, 8, 9, 10 re-placed; floor joint 4 extended through the lower-left floor; added the window bar bottom edge, 13, and ceiling joist edges. Removed after run 2: a floor mark whose green crossed a patten (shoe) and a duplicate joist edge. Run 3 re-placed joist edges 19 and 20 and both canopy marks. Reject (rebuilt in zoom): 7 (green slants across where the joint should be; I cannot see the joint there well enough to say it is on it, it may be the dress shadow) and 20 (green cuts across the dark joist band at a clearly different angle). Unsnapped: 0 (faint joint in dark far-left floor), 9 and 24 (canopy fringe), 17 and 22 (joist edges). Rug edges still under unsure (a rug need not lie square). Ceiling joists near the centre (x 700-1000) are almost vertical and crossed by the chandelier chain and a crack; not marked."}},{"id":"van-der-weyden-st-luke","artist":"Rogier van der Weyden","title":"Saint Luke Drawing the Virgin","short":"van der Weyden","date_label":"c. 1435\u201340","year":1437.5,"region":"north","medium":"oil and tempera on oak","place":"Museum of Fine Arts, Boston","img":"img/van-der-weyden-st-luke.jpg","W":1293,"H":1600,"scale":0.6666666666666666,"lines":{"A":[[885.257,1701.872,881.97,1743.742],[926.776,1701.915,924.976,1746.883],[967.692,1701.993,967.256,1746.992],[1008.857,1702.001,1008.76,1735.002],[1049.295,1701.98,1051.185,1734.922],[1135.759,1705.098,1138.712,1737.964],[899.063,2292.025,892.676,2369.763],[967.102,2292.0,965.854,2369.99],[1031.09,2222.049,1038.08,2368.882],[1254.97,2333.198,1265.965,2373.762],[1327.767,2332.943,1336.026,2374.122],[1400.21,2336.836,1410.187,2371.427],[1317.939,2292.705,1326.859,2327.583]],"B":[[84.082,1804.933,165.988,1730.03],[92.092,2180.064,177.1,2056.477],[884.593,1708.094,882.228,1741.009],[926.439,1708.03,925.062,1741.001],[967.547,1708.001,967.33,1738.0],[1008.942,1707.994,1008.68,1735.0],[1049.639,1709.985,1051.24,1730.929],[1092.704,1712.898,1098.297,1733.14],[1135.84,1710.036,1139.214,1739.846],[968.028,2261.999,965.761,2363.974],[1032.526,2262.071,1037.991,2363.924]]},"groups":{"A":["floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor"],"B":["furniture","furniture","floor","floor","floor","floor","floor","floor","floor","floor","floor"]},"sigma":{"A":[0.5848,0.4317,0.4605,0.5134,0.4371,0.4825,0.2821,0.29,0.2525,4.5633,0.4192,0.4673,0.8319],"B":[0.3445,0.2557,0.712,1.1218,0.5869,0.5571,20.492,2.366,1.2249,0.2744,0.2685]},"tau":2.317207092298599,"tau95":[1.0906387086984484,3.2144653380427597],"rms":2.0992997180950392,"rms95":[1.2508369273994482,2.8464632277342123],"vp":[986.5004055177578,875.3619725844947],"tauA":1.6600553646227159,"tauB":2.80040053126549,"reader_gap":0.0700863208619896,"by_group":{"floor":{"n":22,"tau":1.9804137521175065,"vp":[980.1882054267545,680.2978650368019]},"furniture":{"n":2,"tau":null,"vp":null}},"source":{"file":"File:Saint Luke Drawing the Virgin MFA Boston.jpg","url":"https://commons.wikimedia.org/wiki/File:Saint_Luke_Drawing_the_Virgin_MFA_Boston.jpg","license":"Public domain","credit":"Artist: Rogier van der Weyden; Credit: http://www.mfa.org/collections/object/saint-luke-drawing-the-virgin-31035"},"true_vp":null,"edges":18,"measurable":true,"share1":0.6911177915579887,"share1_95":[0.5916872600071651,0.9105561179165923],"share05":0.5644587869787108,"share2":0.848890966558826,"share1_flat":0.5777694299494112,"share1_A":0.717400400957828,"share1_B":0.663639591846922,"vp1":[986.2067207291617,880.1750955350681],"points":[{"cum_share":0.6911177915579889,"vp":[986.2067207291617,880.1750955350681]},{"cum_share":0.8777760023383776,"vp":[938.5077302106358,1023.5610556983947]},{"cum_share":1.0,"vp":[1019.3118603640703,660.8081324911759]}],"notes":{"A":"Round 2 (after the addendum). I redid the whole selection with `zoom` at 4x. Marked: the tile joints running into depth. Seven are in the pavement strip visible at the loggia threshold behind the Virgin (0-6). Nine are in the front pavement, the square tiles with inlays (7-15). Two are in the patch between the Virgin's robe and St Luke (16, 17). Review was run once in round 2, and every green line was checked in zoom A. Rejected: 5 (the green tilts about 7 px off the near-vertical joint, towards a tile-colour boundary); 10 (settled about 6 px right of the joint I meant, probably on an inlay edge); 15 (short vertical green left of the tile edge I marked); 16 (the edge of the Virgin's blue robe, not the joint); 17 (I could not confirm in zoom that the green is on the joint rather than a shading boundary). All 18 marks snapped. Unsure (1, snapped): the diagonal top edge of the Virgin's throne armrest at the far left. The throne may not be set square to the picture. Not marked: the throne step and cushion (their edges do not read as depth edges); the loggia plinths, threshold, windows and right-hand room (frontal edges only); the ceiling beams (too dark); the landscape.","B":"Round 2 (zoom, new snap parameters); one review run in round 2, all marks rebuilt from 4x zoom. Lines: the Virgin's settle, arm-rest top edge 0 and its lower edge 3, seat-front bright edge 1 and the moulding line above it 2; floor joints in the visible strip behind the Virgin's mantle 4-11; joints of the bottom floor rows 12-14. Reject (rebuilt in zoom): 2 and 3 (each settled on the neighbouring, stronger edge, the same edge as 1 and 0 respectively, not the one meant); 10 (settled on the edge of the Virgin's mantle, not the floor joint); 12 (green straddles two tile rows whose side edges do not line up, so it is not on one joint). Changes from round 1: removed the steep right-hand floor marks near St Luke (the floor there is a diagonal pattern and the green lines in round 1 ran along tile diagonals); added the settle's second edges and bottom-row joints at x 893 and 1035. Still not marked, after looking at 4x: the ceiling (uniformly dark, no beam edges visible), the loggia (its plinths, parapet and window reveals show only verticals and transversals; the landscape buildings are outside the room), and the right-hand side room (window frames are vertical/transversal)."}},{"id":"domenico-veneziano-st-lucy","artist":"Domenico Veneziano","title":"Saint Lucy Altarpiece","short":"D. Veneziano","date_label":"c. 1445\u201347","year":1446,"region":"italy","medium":"tempera on panel","place":"Uffizi, Florence","img":"img/domenico-veneziano-st-lucy.jpg","W":1600,"H":1589,"scale":0.7452258965999069,"lines":{"A":[[408.349,340.412,478.181,455.948],[393.927,352.328,461.148,458.899],[391.746,498.824,453.398,583.819],[400.263,504.375,456.752,581.995],[1781.534,372.813,1714.699,472.478],[1753.48,360.946,1702.247,442.132],[1760.45,480.246,1696.967,567.618]],"B":[[403.968,333.436,484.871,466.818],[369.951,386.433,450.673,505.681],[370.658,463.245,437.397,555.667],[1781.069,373.364,1696.093,500.597]]},"groups":{"A":["left-wall","left-wall","left-wall","left-wall","right-wall","right-wall","right-wall"],"B":["left-wall","left-wall","left-wall","right-wall"]},"sigma":{"A":[0.2567,0.2556,0.2703,0.2777,0.2575,0.2709,0.2618],"B":[0.251,0.2526,0.2608,0.2506]},"tau":0.0,"tau95":[0.0,0.0],"rms":0.13615742423693805,"rms95":[0.08082446879862402,0.15911430528808732],"vp":[1072.459949149022,1432.3739365660415],"tauA":0.0,"tauB":0.0,"reader_gap":0.0007434223302132749,"by_group":{"left-wall":{"n":7,"tau":0.0,"vp":[1068.0432474053737,1425.8501222057585]},"right-wall":{"n":4,"tau":0.0,"vp":[1130.9153568668657,1346.0045793612237]}},"source":{"file":"File:Domenico Veneziano 002.jpg","url":"https://commons.wikimedia.org/wiki/File:Domenico_Veneziano_002.jpg","license":"Public domain","credit":"Artist: Domenico Veneziano; Credit: The Yorck Project (2002) 10.000 Meisterwerke der Malerei (DVD-ROM), distributed by DIRECTMEDIA Publishing GmbH. ISBN: 3936122202."},"true_vp":null,"edges":8,"measurable":true,"share1":1.0,"share1_95":[1.0,1.0],"share05":1.0,"share2":1.0,"share1_flat":1.0,"share1_A":1.0,"share1_B":1.0,"vp1":[1072.4642035628988,1432.3844850339651],"points":[{"cum_share":1.0,"vp":[1072.4642035628988,1432.3844850339651]}],"notes":{"A":"Worked with zoom (4x) from the start; one review run. The floor is a lozenge (diamond) pavement whose joints run diagonally, not into depth, and the throne base is polygonal with oblique faces, so neither gives orthogonals. The only clear orthogonals are the four short entablature returns that run steeply back into depth in the two side bays (left x~360-520 y~340-590, right x~1660-1780 y~320-590); each is marked by its outer edge and the moulding grooves. Rejected: 2 (settled on the same groove as 1), 3 (settled on an inner moulding line, not the band edge meant), 11 (settled next to 10, not the line meant). 6 and 7 unsnapped (soft edges against blue/green). Unsure: the gently sloping entablature runs of the back structure at both sides (cannot tell whether they depict walls running into depth or oblique faces of a polygonal exedra). Few usable lines; this picture contributes little.","B":"Worked with zoom from the start; review run three times. The only orthogonals I could identify are the entablatures of the rear structure's two side walls, which run straight back from the front arcade (seen as steep bands, left above St John and right above St Lucy). The adjoining gently sloping entablature pieces that link them to the central back wall I judged to be oblique walls of a polygonal rear structure (set at an angle to the picture), so they are not marked; the central back entablature and the front arcade are parallel to the picture plane. The pavement is a pattern of diamonds (diagonals, not orthogonals); the dais steps are polygonal with angled sides; arches are curved. So only 6 marks. 0 settled on the first moulding line ~3 px inside the outer edge of the upper left band, which is part of the same cornice and runs along it; accepted. Changes: 2 was moved twice (first snap took a groove ~10 px from the meant edge, second the band's lower edge); in the third review it was placed on that lower edge of the lower band and snapped there. 3 (right upper band against the sky) and 5 (a line in the right lower band) did not snap: soft edges."}},{"id":"petrus-christus-frankfurt","artist":"Petrus Christus","title":"Virgin and Child with Saints Jerome and Francis","short":"P. 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Marked: the receding edges of the dais top on both sides (gold moulding edges and the red/gold boundary), the tops of the two rosette blocks of the throne base, a faint receding line continuing the right dais edge up to y~1440, and a dim receding beam/cornice on the right wall at the top (11, 12, both unsnapped: very low contrast in the dark paint). Not marked: the carpet edges (the carpet drapes over the dais and its borders are curved or hang vertically), the floor tiles (lozenge pattern, diagonals only), throne pinnacle caps (too small). Unsure: three diagonal edges around the left window (a wall edge at upper left and two edges where dark shapes cut the glazing); they could be window-embrasure edges running into depth, or open shutters at an unknown angle. Rejects: 3 (meant the right edge of the upper gold band behind St Peter; it snapped onto the left edge, same as 2); 8 (meant the dark-strip/floor boundary on the right dais edge; it snapped onto the gold/dark boundary, same as 7).","B":"Usable; dark reproduction, the upper room and right wall are nearly black. Worked with zoom from the start; one review run. The room has few clearly depicted orthogonals: the floor is a diagonal lozenge pattern (not marked), the far wall, window and doorway are frontal. Marked: the left and right sides of the stepped dais (lit strip edges and a highlight line on the left strip, the lit strip and a faint far edge on the right), the side edges of the two small plinths at the throne's front corners, the side of the throne's left base, and two faint lintel/beam edges on the right wall near the top. Rejected 10 (short green at a noticeably steeper angle than the beam edge meant; it seems to have caught a different stroke). 9 unsnapped (the dark beam underside). Unsure: a dark diagonal frame member at the top left beside the window (possibly a splayed window reveal, so not necessarily square to the picture). Not marked: the canopy and throne posts (frontal/vertical), the carpet (cloth; its pattern is diagonal), the floor lozenges."}},{"id":"piero-flagellation","artist":"Piero della Francesca","title":"Flagellation of Christ","short":"Piero","date_label":"c. 1455\u201360","year":1458,"region":"italy","medium":"tempera on panel","place":"Galleria Nazionale delle Marche, Urbino","img":"img/piero-flagellation.jpg","W":1600,"H":1143,"scale":0.6666666666666666,"lines":{"A":[[280.388,361.564,372.315,443.286],[280.311,316.672,408.541,438.68],[441.269,505.555,528.929,583.046],[441.84,469.04,559.207,580.704],[559.799,611.273,627.152,670.969],[580.689,601.324,657.453,672.964],[347.419,275.607,428.673,363.912],[738.338,263.389,772.748,333.389],[865.769,262.426,900.025,358.502],[886.285,269.418,915.973,357.553],[993.181,264.822,1007.105,329.337],[1119.86,265.023,1126.625,351.758],[939.271,1469.995,994.795,1406.967],[1096.978,1472.834,1117.106,1409.978],[1562.615,1412.482,1650.979,1469.199],[1670.511,1398.555,1792.579,1456.217],[591.306,1610.042,737.026,1504.374],[824.708,1604.213,910.199,1507.608],[1050.545,1612.386,1086.899,1501.177],[1686.396,1494.929,1736.452,1522.472],[1769.963,1544.369,1867.538,1608.928],[1245.261,1401.934,1262.316,1474.969],[1267.631,1499.867,1293.496,1610.894],[1233.497,1350.891,1241.788,1389.0],[1847.77,402.806,1912.104,327.557],[828.874,503.17,839.04,580.504],[886.63,513.08,894.892,575.535],[911.116,465.874,920.692,549.327],[1010.284,528.194,1030.663,571.653],[1088.293,477.234,1122.749,585.904],[1123.717,467.07,1160.459,578.148]],"B":[[274.129,310.957,411.192,441.09],[255.916,339.376,369.946,441.387],[442.034,469.298,561.674,582.927],[414.851,482.176,527.294,581.456],[571.94,593.184,655.284,670.963],[560.415,611.645,629.922,673.433],[610.688,265.787,652.555,331.598],[759.176,272.351,785.513,326.268],[866.744,265.091,897.919,352.721],[885.356,266.78,908.388,334.996],[992.995,263.714,1006.8,328.254],[1119.884,264.014,1124.86,329.825],[1246.075,1405.653,1262.567,1475.739],[1269.019,1505.728,1290.722,1599.243],[1233.644,1351.643,1243.201,1395.615],[309.071,267.666,424.91,385.166],[336.782,263.875,432.158,367.723],[477.071,460.258,586.836,571.107],[511.906,471.4,587.197,548.829]]},"groups":{"A":["ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","other","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling"],"B":["ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","floor","floor","floor","ceiling","ceiling","ceiling","ceiling"]},"sigma":{"A":[0.2603,0.2473,0.2683,0.252,0.2776,0.2722,0.2632,0.2909,0.4694,0.2899,0.305,0.3002,0.4064,0.3646,0.3195,0.5508,0.2519,0.2714,0.7212,2.7733,0.2644,0.2922,0.2606,0.3983,0.3177,0.333,1.0538,1.9722,0.5368,0.3515,0.7151],"B":[0.2489,0.2509,0.2498,0.2549,0.2712,0.2756,0.2947,0.6436,0.5763,0.3392,0.3117,0.3017,0.2939,0.272,0.4701,0.2486,0.2595,0.2979,0.2813]},"tau":5.3862479374238905,"tau95":[2.593900509923179,7.682304851087732],"rms":4.7459838931414255,"rms95":[2.4164897897597064,6.8002541471597695],"vp":[1194.5471388960082,1190.4787259146372],"tauA":6.950161403523401,"tauB":0.11671841579920486,"reader_gap":0.007130283924548108,"by_group":{"ceiling":{"n":34,"tau":6.479002870378084,"vp":[1218.2885895337613,1244.2445228893725]},"floor":{"n":15,"tau":0.3687754447045527,"vp":[1194.1066693984233,1176.5142726452134]},"other":{"n":1,"tau":null,"vp":null}},"source":{"file":"File:Piero della Francesca - Flagelaci\u00f3n de Cristo, 1468-1470 (Galleria Nazionale delle Marche, Urbino).png","url":"https://commons.wikimedia.org/wiki/File:Piero_della_Francesca_-_Flagelaci%C3%B3n_de_Cristo,_1468-1470_(Galleria_Nazionale_delle_Marche,_Urbino).png","license":"Public domain","credit":"Artist: Piero della Francesca; Credit: https://www.arthistoryproject.com/artists/piero-della-francesca/flagellation-of-christ/"},"true_vp":null,"edges":36,"measurable":true,"share1":0.9035068455530607,"share1_95":[0.8058479061858931,0.9715993794930713],"share05":0.8811067512918512,"share2":0.9035068455530607,"share1_flat":0.8925683464071382,"share1_A":0.8395490611826946,"share1_B":1.0,"vp1":[1193.5480643722024,1178.3438336114361],"points":[{"cum_share":0.9035068455530607,"vp":[1193.5480643722024,1178.3438336114361]},{"cum_share":0.9758767489879117,"vp":[767.7630405331126,-579.4866668146435]},{"cum_share":1.0,"vp":[762.7795110722119,0.38117384009331073]}],"notes":{"A":"Worked with zoom from the start; three review runs. Marked: both edges of the coffered ceiling's diagonal ribs over the left loggia bay (the dark-glazed coffer strips and rib mouldings), the left edges (and one right edge) of the front ceiling ribs over Christ's hall, the thin drawn rib lines of the rear ceiling bay, the dark joint lines in the two terracotta floor bands (left and right parts), the edges of the white pavement strip below the column base (1233-1292), and the eave of the red-roofed building at right. Review 1 -> 2: corrected marks 6 and 39 onto the edges the paint actually has there (6: a moulding groove of the same rib; 39: the eave board under the tiles, 6 px below my mark on the tile edge); moved 7; added nine rear-bay rib lines (40-48). Review 3: dropped one unsure floor line under the black shoes (2005,1554)-(2100,1592) because it snapped to a horizontal streak. Rejects: 7 (mark on a flat light part of the rib; snapped onto another groove); 8, 9 (the front rib there is too soft, the line runs diagonally across the rib band); 11, 15 (meant the right edges of ribs, settled on the left edges, duplicating 10 and 14); 37, 38 (short oblique pavement edges, snapped onto horizontal transversals); 43, 45 (rear-bay rib lines, green follows a neighbouring drawn line with a different slope). Unsnapped: 17 and most of the left-hand floor joints (18-22, 27, 28): thin dark lines on a floor painted with strong horizontal streaks; 46. Floor tile lines of the black/white pavement under Christ are mostly transversal or diagonal pattern edges and were not marked.","B":"Photograph includes the frame and raw panel border; marked only the painted field. Worked with zoom from the start; review run twice (second run only added marks 20-25). Lines: edges of the three dark openings in the left side architrave of the loggia ceiling and three molding grooves on its lit side (plus two beside the middle opening), rib edges between the coffers of the front ceiling bay, and the left edge of the white marble strip that runs from the foreground to the right-hand column (two pieces, split by the white cross band), plus the short edge where the hall pavement meets that column's plinth. Rejected 7 (landed on the same line as 6), 8 (landed about 13 px off, on the same line as 9), 13 (same line as 12), 15 (same line as 14), 22 (same groove as 21), 25 (landed on a shading line inside the beam face, not its lower edge). 16 unsnapped. Not marked: the many long straight lines in the second and third ceiling bays (I could not tell painted coffer ribs from incisions or craquelure), the black-and-white hall pavement (a circle-and-band pattern; could not tell which edges run straight back), the red foreground paving (diagonal pattern), the right-hand buildings (unclear whether they are set square), the cornice returns (stepped profiles)."}},{"id":"bouts-last-supper","artist":"Dieric Bouts","title":"Last Supper (Altarpiece of the Holy Sacrament)","short":"Bouts","date_label":"1464\u201368","year":1466,"region":"north","medium":"oil on panel","place":"St Peter's Church, 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Bouts - The Last Supper.jpg","url":"https://commons.wikimedia.org/wiki/File:Dieric_Bouts_-_The_Last_Supper.jpg","license":"Public domain","credit":"Artist: Dieric Bouts; Credit: https://artinflanders.be/en/fill-form-download-your-image?photo_number=0050305000"},"true_vp":null,"edges":76,"measurable":true,"share1":0.9966586311506899,"share1_95":[0.9889350242073104,1.0],"share05":0.9731272717755064,"share2":0.9966586311506901,"share1_flat":0.9881473040570949,"share1_A":1.0,"share1_B":0.9914766417035646,"vp1":[967.390413072026,645.5248266932174],"points":[{"cum_share":0.9966586311506901,"vp":[967.390413072026,645.5248266932174]}],"notes":{"A":"Worked with zoom from the start (4x). Ceiling joists of both bays, left-wall window transoms and sills, hatch-shelf sides, bench-top sides and the floor-pattern stripe edges in the foreground band (y 1990-2300). Review run 1: marks 27-29 (back-bay joists at right) had been drawn at the wrong angle, corrected after zooming; review run 2 was an accidental no-op rerun; run 3 is final (limit reached). Rejected: 32, 33, 35 (small wall sills where green took a different edge or angle than meant), 41 and 43 (bench-top side edges where green settled on drapery or tile edge). Unsure: the left-wall top edge and back-left wall top edge under the ceiling (dark, cannot tell whether wall-top or beam), and two dresser moulding edges at right (cannot tell if dresser is set square). Front ceiling joists: green often sits on the shadow side of the joist rather than the lit side, same joist edge meant, accepted.","B":"Worked with zoom from the start; review run twice. Orthogonals: sides of the ceiling joists in both the front and the rear ceiling (0-23, 55-67), the ceiling/right-wall junctions (24, 25), the left wall's window transom and sills (26-33), the table's receding left and right edges (34-36), and the floor's tile joints and strip edges running into depth (37-54). Unsure: the top edge of the cupboard shelf by the back wall (not sure it is set square). Not marked: the rear room's floor (hidden), the right-hand room beyond the arcade, arches, the fireplace hood (seen frontally). Changes after review 1: 12 and 25 re-marked (12 had snapped to the neighbouring joist edge; 25 onto the lighter beam face rather than the ceiling/wall junction); 13 more joist edges added (55-67). Rejects (each checked at 4x): 0/2/4/7/15/19/55/56/57/58 each settled on the same edge as its neighbouring mark (the joist's shadowed edge), not the lit opposite edge I meant; 27 settled on the transom's top edge, same as 26; 29, 33 and 35 settled on a line of a different slope than the sill/table edge meant; 60/61 cut across joists; 66/67 settled on joist edges at a different angle to the ones meant. Floor lines 48, 50, 51 sit ~5 px off the mark but on the same tile edge, accepted."}},{"id":"ideal-city-urbino","artist":"Unknown","title":"The Ideal City (Urbino panel)","short":"Ideal City","date_label":"c. 1470\u201390","year":1480,"region":"italy","medium":"tempera on panel","place":"Galleria Nazionale delle Marche, Urbino","img":"img/ideal-city-urbino.jpg","W":1600,"H":461,"scale":0.8333333333333334,"lines":{"A":[[722.673,527.205,823.586,480.971],[1402.862,167.452,1468.086,130.415],[1403.904,259.726,1468.863,236.459],[1403.987,356.907,1475.3,346.986],[282.006,62.986,398.583,124.905],[291.862,185.391,396.506,222.415],[290.105,280.559,392.91,301.938],[294.996,321.239,398.888,336.455],[419.164,315.111,501.228,333.045],[425.053,346.586,505.402,356.834],[25.933,70.127,47.979,79.612],[1305.336,304.361,1363.704,290.466],[513.019,315.938,566.136,326.877]],"B":[[296.071,45.831,348.412,75.162],[287.899,175.348,392.145,213.477],[290.072,280.611,404.662,304.244],[288.95,320.344,398.775,336.447],[298.383,71.644,396.385,123.776],[455.196,135.111,530.996,177.812],[440.022,245.633,511.176,269.344],[439.563,314.183,507.264,327.507],[437.026,347.807,508.387,357.377],[442.243,464.719,519.947,457.929],[521.44,268.644,564.036,283.155],[518.229,314.942,565.47,323.953],[570.72,275.453,674.083,306.761],[600.637,301.908,662.207,325.672],[599.805,340.093,661.806,352.152],[606.02,381.265,659.431,389.215],[603.22,447.85,660.118,444.432],[24.936,70.134,41.82,76.372],[1340.929,244.821,1404.013,216.867],[1371.303,277.562,1405.358,265.893],[1304.651,304.522,1363.021,290.632],[1312.006,440.652,1404.866,445.875],[1402.474,167.534,1467.797,130.684],[1407.649,258.516,1466.951,237.25],[1404.968,356.788,1470.321,347.569],[1409.923,457.278,1469.708,462.356],[1521.055,123.105,1608.718,77.103],[1523.308,263.174,1615.924,237.907],[1524.893,353.859,1617.311,343.469]]},"groups":{"A":["floor","right-wall","right-wall","right-wall","left-wall","left-wall","left-wall","left-wall","left-wall","left-wall","ceiling","right-wall","left-wall"],"B":["left-wall","left-wall","left-wall","left-wall","left-wall","left-wall","left-wall","left-wall","left-wall","left-wall","left-wall","left-wall","left-wall","left-wall","left-wall","left-wall","left-wall","ceiling","right-wall","right-wall","right-wall","right-wall","right-wall","right-wall","right-wall","right-wall","right-wall","right-wall","right-wall"]},"sigma":{"A":[0.2815,0.3859,0.3668,0.3264,0.2754,0.2608,0.2995,0.2685,0.9433,0.3439,1.9115,0.3863,3.1082],"B":[0.3207,0.2611,0.2741,0.2679,0.2963,0.2808,2.6953,0.3379,0.29,0.2877,0.67,2.8567,0.3632,1.1088,2.0708,1.9246,0.3558,3.2878,0.3098,0.5119,0.4328,0.4317,0.333,0.3907,0.3079,0.8199,0.2669,0.5442,0.2787]},"tau":1.2742807358791155,"tau95":[0.0,1.8044121554153065],"rms":1.3814124047429752,"rms95":[0.6892380521337007,1.8433029880415854],"vp":[954.4062061686828,416.76017855102265],"tauA":1.4163922220822296,"tauB":1.2670889353587458,"reader_gap":0.008068985210002001,"by_group":{"ceiling":{"n":2,"tau":null,"vp":null},"floor":{"n":1,"tau":null,"vp":null},"left-wall":{"n":24,"tau":1.0293211836220157,"vp":[975.338167762822,422.24261300527445]},"right-wall":{"n":15,"tau":1.4942197194577322,"vp":[944.4028455758013,415.60347223566544]}},"source":{"file":"File:Formerly Piero della Francesca - Ideal City - Galleria Nazionale delle Marche Urbino.jpg","url":"https://commons.wikimedia.org/wiki/File:Formerly_Piero_della_Francesca_-_Ideal_City_-_Galleria_Nazionale_delle_Marche_Urbino.jpg","license":"Public domain","credit":"Artist: Unknown authorUnknown author; Credit: Own work"},"true_vp":null,"edges":33,"measurable":true,"share1":0.929705895600629,"share1_95":[0.815505184214993,1.0],"share05":0.8917847675140579,"share2":0.9426559334919987,"share1_flat":0.8270114648092459,"share1_A":0.9446116007202593,"share1_B":0.9222315763962547,"vp1":[946.376474902662,420.56936197454456],"points":[{"cum_share":0.929705895600629,"vp":[946.376474902662,420.56936197454456]},{"cum_share":1.0,"vp":[947.4109038359704,389.5502960800208]}],"notes":{"A":"Worked with zoom (4x) from the start; three review runs. Orthogonals: the grey pavement bands that run into depth (both edges of four bands), the receding side faces of the flanking palaces (cornices, string courses, balcony rails, entablatures) on the left building, the pale palace behind it, the grey palace at right, two street-front eaves/cornices, and the pergola beams on the roof of the left building. Run 1 -> run 2: on the dense mouldings snap often jumped to a stronger neighbouring moulding edge; duplicates were removed and marks re-aimed at clearly visible moulding edges (so indices changed between runs); horizontal-snapping roof-beam marks dropped. Run 3 added two short beam marks (23, 24), which still snapped to the horizontal entablature: rejected. Also rejected: 16 (meant the lower cornice moulding, green took the cornice top edge) and 17 (meant the top of the balcony rail, green took its lower edge). Most pavement-band edges are soft and crossed by transversal joints and stay unsnapped (0,1,3-7); 12 unsnapped. Rotunda, octagonal well-heads and their steps not marked (not square to the picture).","B":"Worked with zoom from the start; review run three times. Orthogonals are the cornices, string courses, sills and bases on the receding side faces of the buildings flanking the piazza: left palace side loggia and floors (0-5), pink palace (6-10), the two smaller buildings beyond it (11-17), a loggia roof-beam underside on the left palace's top floor (18), and on the right the eaved house and its neighbour (19-22), the grey palace's receding face (23-27) and the receding left face of the big right palace (28-31). Front faces (horizontal), the round temple, pediment rakes and the octagonal-looking well pedestals were not marked. The pavement bands form a rotated diamond pattern whose members I could not tell apart from orthogonals with confidence, so none were marked. Changes between reviews: after review 1, 0 was shortened to the stretch of the top cornice edge against blue sky (the full-length mark snapped to the architrave), and the architrave's lower edge was added as its own line (5); marks 4, 9, 22, 23, 24 were moved onto the neighbouring moulding edge the paint actually gave (same moulding, same face); three marks that duplicated a neighbour's edge were removed, and the right palace's left face (now 28-31) was added; after review 2, 25, 28 and 29 were moved onto the stronger edge of their moulding and the two remaining beam marks (snapped to the horizontal front entablature) were removed. Rejects after review 3: 25 settled on the same ledge edge as 26; 29 settled on the upper edge of the string course, not the lower one meant. 1 (parapet top of the left palace) did not snap. Many further short near-horizon lines (ground-floor entablatures and bases) remain unmarked because the three reviews were used up."}},{"id":"perugino-keys","artist":"Perugino","title":"Delivery of the Keys","short":"Perugino","date_label":"1481\u201382","year":1481.5,"region":"italy","medium":"fresco","place":"Sistine Chapel, Vatican","img":"img/perugino-keys.jpg","W":1600,"H":966,"scale":0.8333333333333334,"lines":{"A":[[510.522,628.545,666.638,575.135],[729.118,552.324,754.018,541.885],[889.55,545.765,836.826,599.105],[898.155,545.143,852.957,597.283],[1102.595,605.626,1153.189,656.853],[1089.552,606.859,1134.787,658.965],[1776.9,639.504,1812.242,646.351],[1609.57,568.836,1675.046,577.329],[1707.065,579.507,1825.89,596.701],[1713.978,560.2,1818.666,568.269],[356.424,174.797,382.951,188.802],[357.816,236.922,380.147,245.715]],"B":[[508.712,629.104,667.654,574.686],[849.014,601.665,892.444,551.965],[1098.451,601.625,1153.397,656.987],[1614.717,569.063,1789.899,594.367]]},"groups":{"A":["floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","back-structure","back-structure"],"B":["floor","floor","floor","floor"]},"sigma":{"A":[0.2572,1.2516,0.3168,0.4242,0.5714,0.358,0.4628,0.4225,0.2678,0.6283,1.2619,1.1898],"B":[0.2728,0.5366,0.3078,4.2948]},"tau":1.0207560032837826,"tau95":[0.17426159804775332,1.6780287096165967],"rms":1.0282549974901423,"rms95":[0.4906700945747783,1.635750692628436],"vp":[965.5215088239262,468.4619864592432],"tauA":1.2979879427130436,"tauB":0.2652657628660734,"reader_gap":0.0007849215241956369,"by_group":{"back-structure":{"n":2,"tau":null,"vp":null},"floor":{"n":14,"tau":1.0239093101235262,"vp":[965.8137325701929,468.08018434293564]}},"source":{"file":"File:Entrega de las llaves a San Pedro (Perugino).jpg","url":"https://commons.wikimedia.org/wiki/File:Entrega_de_las_llaves_a_San_Pedro_(Perugino).jpg","license":"Public domain","credit":"Artist: Pietro Perugino; Credit: See below."},"true_vp":null,"edges":11,"measurable":true,"share1":0.852999309101917,"share1_95":[0.7686256666152079,1.0],"share05":0.852999309101917,"share2":0.9799569874936762,"share1_flat":0.8307312367115157,"share1_A":0.8042139231092245,"share1_B":1.0,"vp1":[965.7983661621494,469.20060016562707],"points":[{"cum_share":0.852999309101917,"vp":[965.7983661621494,469.20060016562707]},{"cum_share":0.9999999999999998,"vp":[886.5483880480293,486.3942674416696]}],"notes":{"A":"Worked with zoom from the start. Marked: pavement bands running into depth (two edges where the band is wide enough: the band left of Christ, the two bands either side of the centre, the band behind the kneeling boy), the thin receding pavement lines on the right, and the cornice returns on the side faces of the two triumphal arches. Not marked: transversal bands, step ends of the temple stairs (drawn as staircase profiles, no single edge), the octagon's oblique faces, and the pavement under the left-hand crowd (too broken to trace). Review 1 (26 marks): dropped a mark near (127,637)-(250,615) that zoom showed lay on a halo outline, not a band; dropped two lower-cornice marks on the arches (too blurred to see an edge); moved marks on the big left band, the right thin lines and the right-arch cornices to the edges seen at 4x. Review 2 (22 marks) is the final one. Rejects: 0 snapped to the lower edge of the band (meant the upper edge; 1 has the lower edge); 3, 8, 10 snapped to the horizontal base of the temple steps; 12 and 16 snapped to horizontal transversal lines; 20 and 21 settled on a moulding line a few px below the right-arch cornice top edge I meant. 9 and 11 are unsnapped (weak, shallow pavement lines crossed by transversals).","B":"Usable, but at 1920 px the piazza's pavement orthogonals are only 1 to 3 px wide and are crowded by the horizontal transversals 5 to 10 px away, so few of them snap. Worked with zoom from the start. Review run three times: run 1 used rough marks, many unsnapped or landing on transversals; run 2 re-marked all lines on edges read at 4x; run 3 corrected three marks (5 moved to the lower edge of the right band; 7 shortened so it no longer crosses a head, since in run 2 it had been fitted across a figure; 12 moved to the band's lower edge, which is where run 2 had snapped it). Lines marked: both edges of the broad brown band left of centre, both edges of the steep band in the centre (above Christ's halo), the edge of the band running down to the right behind the apostles' heads, pieces of the band right of centre, and the thin pavement orthogonals on the right side of the piazza and one on the left. Rejected: 0 (landed on the same lower edge as 1), 3 (landed on the same edge as 2), 6, 7 and 11 (landed on horizontal transversals or the bottom step edge next to the faint orthogonal I meant), 12 (landed on the boy's arm). Unsnapped: 5, 9, 10, 13. Not marked: the temple, porticoes, steps and triumphal arches (all frontal, and the temple is octagonal); orthogonals on the far left, which I could not make out among the figures."}},{"id":"crivelli-annunciation","artist":"Carlo Crivelli","title":"Annunciation with Saint Emidius","short":"Crivelli","date_label":"1486","year":1486,"region":"italy","medium":"egg tempera with some oil on canvas","place":"National Gallery, London","img":"img/crivelli-annunciation.jpg","W":1134,"H":1600,"scale":0.6666666666666666,"lines":{"A":[[847.664,987.613,621.35,1165.731],[740.651,605.52,619.624,896.342],[827.83,657.972,731.756,820.732],[842.454,666.419,752.711,811.978],[858.551,702.99,784.2,812.059],[823.132,860.252,706.83,997.635],[844.387,890.188,702.677,1036.933],[103.954,2025.921,23.496,2196.94],[258.839,2079.473,228.252,2204.794],[447.403,2066.003,446.492,2204.0],[608.506,1972.096,651.266,2156.195],[689.371,1802.196,880.755,2206.153],[713.639,1801.69,879.414,2117.866],[688.483,1598.969,751.24,1679.377],[16.802,456.397,190.506,795.495],[297.539,1509.117,258.102,1565.736],[1430.132,19.341,1374.954,90.442],[1478.728,130.643,1384.468,235.505],[23.002,536.083,130.549,733.715],[123.975,184.008,227.191,535.152],[157.694,443.102,195.481,553.832],[1344.553,129.651,1319.05,163.021],[1125.731,21.999,1091.761,75.212],[1069.15,130.081,1046.702,172.508],[1592.337,73.968,1556.585,110.337],[838.524,41.549,817.939,110.541],[855.62,71.548,842.829,111.554],[1220.857,68.977,1197.287,107.31],[804.086,1719.68,875.151,1804.978],[817.889,1683.74,873.506,1742.863],[834.143,1643.975,876.091,1678.04],[795.936,1811.161,878.222,1932.973],[831.915,1810.608,875.171,1868.281],[249.439,1510.845,224.52,1536.831],[449.386,1494.013,448.587,1557.008]],"B":[[827.523,658.717,573.902,1087.296],[854.849,708.895,613.629,1060.02],[803.785,932.374,645.269,1096.255],[829.704,965.668,602.566,1166.21],[822.229,861.429,734.825,964.315],[559.524,13.046,526.012,386.546],[74.607,13.115,203.727,456.705],[16.627,456.221,201.466,816.581],[20.342,2203.508,103.428,2027.095],[229.826,2209.203,261.028,2080.944],[444.096,2205.99,444.927,2067.992],[1442.544,170.588,1320.587,307.027],[133.701,903.478,182.099,964.648],[1430.095,19.288,1371.384,95.242],[642.301,47.694,587.223,397.384],[298.265,1508.244,258.742,1564.803],[255.918,1504.894,222.197,1534.776],[446.999,1492.967,446.156,1561.961],[606.314,1973.604,649.054,2157.708],[1053.349,1040.521,1175.385,990.215],[761.676,592.854,612.037,930.151],[1576.857,46.629,1523.999,103.987],[1202.841,46.586,1168.935,103.211],[1344.237,130.165,1320.488,161.1],[109.169,300.889,193.429,547.913]]},"groups":{"A":["right-wall","right-wall","right-wall","right-wall","right-wall","right-wall","right-wall","floor","floor","floor","floor","right-wall","right-wall","right-wall","left-wall","floor","ceiling","ceiling","left-wall","left-wall","left-wall","ceiling","ceiling","ceiling","back-structure","back-structure","back-structure","back-structure","right-wall","right-wall","right-wall","right-wall","right-wall","floor","floor"],"B":["right-wall","right-wall","right-wall","right-wall","right-wall","right-wall","left-wall","left-wall","floor","floor","floor","ceiling","left-wall","ceiling","right-wall","floor","floor","floor","floor","ceiling","right-wall","ceiling","ceiling","ceiling","left-wall"]},"sigma":{"A":[0.2419,0.241,0.2475,0.2556,0.2544,0.247,0.2471,0.2476,0.2564,0.2544,0.2463,0.2396,0.2413,0.2849,0.2402,0.2984,0.2745,0.2542,0.2541,0.2402,0.2796,0.4053,1.8962,0.3477,0.3646,0.3238,0.5284,0.3586,0.3028,0.3459,2.8448,0.2709,0.3491,0.7538,0.3214],"B":[0.2393,0.2397,0.2695,0.2413,0.2539,0.2401,0.2395,0.24,0.2465,0.2592,0.253,0.2644,0.3281,0.2724,0.2404,0.2975,3.4472,0.3144,0.2462,0.3517,0.2403,0.2952,0.3037,0.708,0.2735]},"tau":0.26982203181679376,"tau95":[0.0,0.4378683153249362],"rms":0.5898197567194523,"rms95":[0.29664956870800635,0.8702587178869021],"vp":[449.7337381420151,1297.5964228416292],"tauA":0.3598094048153042,"tauB":0.09592564686714902,"reader_gap":0.0006952627958417932,"by_group":{"back-structure":{"n":4,"tau":0.6573211254290707,"vp":[492.9008831082784,1215.228885354986]},"ceiling":{"n":11,"tau":0.3031359014530195,"vp":[448.77201934956423,1287.8837605051633]},"floor":{"n":14,"tau":0.0,"vp":[450.51047428088657,1291.3492137397177]},"left-wall":{"n":8,"tau":0.03605900229601734,"vp":[452.7587413627531,1309.7925387478288]},"right-wall":{"n":23,"tau":0.0,"vp":[450.8783507184073,1298.4597801065554]}},"source":{"file":"File:The Annunciation, with Saint Emidius - Carlo Crivelli - National Gallery.jpg","url":"https://commons.wikimedia.org/wiki/File:The_Annunciation,_with_Saint_Emidius_-_Carlo_Crivelli_-_National_Gallery.jpg","license":"Public domain","credit":"Artist: Carlo Crivelli; Credit: National Gallery"},"true_vp":null,"edges":44,"measurable":true,"share1":0.9893051087607713,"share1_95":[0.971022889213319,1.0],"share05":0.9893051087607713,"share2":0.9940841074631407,"share1_flat":0.9800193031585602,"share1_A":0.9786530239626675,"share1_B":1.0,"vp1":[447.2082739805264,1302.7873728056443],"points":[{"cum_share":0.989305108760771,"vp":[447.2082739805264,1302.7873728056443]},{"cum_share":0.9999999999999998,"vp":[166.85361069433768,1524.0520620289133]}],"notes":{"A":"Worked with zoom (4x) from the start. Orthogonals: right-hand house cornice mouldings and plinth/step edges, window-sill edges, ashlar bed joints of the receding right wall, left-hand house cornice mouldings and a few stone courses, pavement joints running into depth, loggia ceiling beam/coffer-side edges (upper right), side faces of the three pier capitals, Mary's-room ceiling beam edges. Three review runs. Run 1 -> run 2: loggia ceiling marks 20-21 moved onto the coffer-side/beam edge (first drawn on beam centres); added 26 marks. Run 2 -> run 3: removed the old stair-wall cap mark (moved to unsure) so indices after 14 shifted by one; added two pavement joints (48, 49). Rejected (green on a different edge than meant): 13 (sill top edge, green took sill underside like 14), 16/17/18 (left cornice: green on neighbouring moulding lines; those crisp neighbour edges were added deliberately as 22-24), 26 and 27 (meant beam right edges, green went to the coffer-side edge already covered by 20/21), 30 and 34 (capital bevel: green on the far side of the bevel strip), 36 and 38 (Mary's ceiling: meant beaded beam edge, green on yellow lit edge), 45-47 (left-wall stone courses: green took steeper block edges). 37 and 44 unsnapped. 42, 43, 48: red slightly off but green sits on the joint meant. Unsure: the stair-wall cap near the child at left (cannot tell what it depicts) and the lectern edge (cannot tell if set square). Many more short ashlar joints exist on the right wall; only the longest clear ones were marked.","B":"Worked with zoom from the start; review run three times. The picture is a street receding into depth: Mary's house on the right (side face with its great entablature, 0-4 and 23; upper storey mouldings 5, 16), the loggia ceiling coffers above (diagonal ribs and coffer bevels, 12-13, 15/26 = one bevel edge split where the bamboo pole crosses it; capital side-returns 24-25), the ceiling beams of Mary's inner room (21-22), the left-hand houses (cornice 6, 7, red band 27-28, window-hood return 14), the brick pier base in the foreground (11), the foreground floor tile joints running into depth (8, 9, 10, 20) and the courtyard pavement beyond the arch (17-19). Not marked: the many brick courses and window reveals, transversal ropes/rods, the rug, figures; loggia arches (curved); the pavement pattern's diagonals. Changes: after review 1, marks 2, 6 and several others moved (several first marks sat mid-band and snapped to neighbouring mouldings), 14 re-marked on the hood's receding edge, more lines added (15-26). After review 2, marks 5, 6 and 23 were moved onto the other edge of the same narrow fillet (4-8 px across), which the paint gives as the stronger edge; each is a genuine orthogonal edge of the same cornice. 15 was split at the pole (15 and 26). The floor line from the pier corner to the back wall base went to unsure because I could not tell whether it is a floor junction or a cast-shadow edge. 27-28 (red band edges on the left house) were added. Rejects after review 3: 11 settled on the lowest mortar course of the pier, not on its base line; 13 settled on the beaded line inside the rib, not on the rib's right edge meant; 22 settled on a highlight strip ~8 px above the beam edge meant; 28 settled on the same edge as 27 (red band's right edge), not its left edge. Accepted with note: 2 settled on the top edge of the frieze (my mark sat mid-frieze; that edge is what I was aiming for); 14 settled on the lower edge of the hood's return."}},{"id":"leonardo-last-supper","artist":"Leonardo da Vinci","title":"The Last Supper","short":"Leonardo","date_label":"c. 1495\u201398","year":1496.5,"region":"italy","medium":"tempera on gesso, pitch and mastic, on wall plaster","place":"Santa Maria delle Grazie, Milan","img":"img/leonardo-last-supper.jpg","W":1600,"H":800,"scale":0.8333333333333334,"lines":{"A":[[37.351,17.468,210.296,100.859],[303.732,145.332,406.726,194.201],[468.436,223.223,522.348,249.559],[1691.732,95.46,1844.569,18.766],[1502.839,189.676,1610.097,135.864],[1373.746,253.484,1446.311,217.494],[1293.091,294.356,1336.841,274.603],[1285.198,155.95,1420.512,28.333],[803.303,9.987,844.795,125.778],[1105.697,15.058,1065.58,140.814],[1243.523,41.734,1182.754,134.621],[654.255,15.411,727.813,125.016]],"B":[[943.167,12.075,949.283,137.927],[970.431,11.983,968.006,137.959],[1098.112,39.144,1070.636,124.846],[1126.205,10.898,1080.838,134.857],[1264.515,11.653,1183.865,130.968],[804.107,12.133,842.652,119.42],[653.589,14.546,715.361,106.77],[1286.52,154.777,1423.927,25.006],[37.712,17.651,216.09,103.59],[296.217,141.546,409.935,195.807],[468.262,223.156,541.054,258.687],[576.43,275.962,622.293,298.269],[1693.324,94.631,1835.435,23.319],[1502.082,190.159,1611.97,134.897],[1373.33,253.686,1448.587,216.372],[1301.388,291.26,1341.827,271.518]]},"groups":{"A":["left-wall","left-wall","left-wall","right-wall","right-wall","right-wall","right-wall","ceiling","ceiling","ceiling","ceiling","ceiling"],"B":["ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","ceiling","right-wall","left-wall","left-wall","left-wall","left-wall","right-wall","right-wall","right-wall","right-wall"]},"sigma":{"A":[0.246,0.2683,0.3728,0.2491,0.2659,0.2942,0.8983,0.2508,0.2622,0.2669,0.2823,0.2688],"B":[0.2668,0.2785,0.2957,0.2941,0.4412,0.2755,0.2916,0.247,0.2456,0.2591,0.3192,0.3471,0.2509,0.2603,0.3026,1.3311]},"tau":0.29567410084205215,"tau95":[0.0,0.5189530376664824],"rms":0.43814801475918586,"rms95":[0.1940391718751306,0.6184404058007416],"vp":[962.0216949699619,461.6940185999821],"tauA":0.5229995530133125,"tauB":0.1671897663549881,"reader_gap":0.0007200836489196417,"by_group":{"ceiling":{"n":12,"tau":0.3775991013577925,"vp":[962.3505680024635,464.9984026840447]},"left-wall":{"n":7,"tau":0.0,"vp":[526.6409954911826,251.6576081453579]},"right-wall":{"n":9,"tau":0.07259390546929301,"vp":[967.1830089384895,456.3983976146961]}},"source":{"file":"File:The Last Supper - Leonardo Da Vinci - High Resolution 32x16.jpg","url":"https://commons.wikimedia.org/wiki/File:The_Last_Supper_-_Leonardo_Da_Vinci_-_High_Resolution_32x16.jpg","license":"Public domain","credit":"Artist: Leonardo da Vinci; Credit: Online Taken on 23 July 2013"},"true_vp":null,"edges":17,"measurable":true,"share1":1.0,"share1_95":[0.9735294073309136,1.0],"share05":0.9857517881055262,"share2":1.0,"share1_flat":0.9857517881055264,"share1_A":1.0,"share1_B":1.0,"vp1":[962.028548234241,457.68314682077727],"points":[{"cum_share":1.0,"vp":[962.028548234241,457.68314682077727]}],"notes":{"A":"Worked with zoom (4x) from the start; one review run. Orthogonals: the top edges of the hanging tapestries on both side walls (3 left, 4 right; their bottom edges are hidden by figures and the table), the edge where the right wall meets the coffered ceiling (wall-side edge of the cornice beam), and the edges of the ceiling ribs running into depth (5 ribs; the coffer rows between them run across and were not marked). The left wall/ceiling junction, the floor and the table's receding edges are not clearly visible in this reproduction. Rejected: 8 (meant the ceiling-side edge of the right cornice beam, green settled on the wall-side edge, same as 7), 10 (meant the right edge of the left rib, green took its left edge, same as 9), 11 and 12 (central rib: both greens settled on one tilted line in the coffer shading just left of the rib, not on either rib edge). 14 unsnapped. The ceiling ribs are soft, heavily restored paint.","B":"Worked with zoom from the start. Orthogonals: both edges of each longitudinal ceiling rib where readable, the right wall's cornice band (ceiling/wall junction), and the top edges of the eight wall hangings (tapestry bottoms are hidden by figures; table is parallel to the picture plane; floor has no pattern). Review run twice: after the first run I corrected marks 2 (R1 rib left edge, was ~5 px off), 5 (R2 rib right edge, was ~12 px off at top) and 6/7 (rib at x~800), and dropped a second mark on the x~650 rib and two faint left-wall niche lintels (edges not legible at 4x). Rejects: 5 settled on the same edge as 4 (R2 rib left edge, not its right edge); 6 settled on the same edge as 7 (right/dark edge of the x~800 rib, not its left edge); 10 (upper edge of the brown cornice band) settled on the band's lower edge, same as 9. Note 2 sits a few px inside the R1 rib band, on a longitudinal tone boundary of the same rib; accepted. The left ceiling/wall junction is very faint (unsure, did not snap). Unsure also: two short near-horizontal tops of small panels on the right wall at eye level (35-55 px long). Ceiling is abraded on the left, so the left-hand ribs are less certain than the right."}},{"id":"raphael-school-of-athens","artist":"Raphael","title":"The School of Athens","short":"Raphael","date_label":"1509\u201311","year":1510,"region":"italy","medium":"fresco","place":"Stanza della Segnatura, Vatican","img":"img/raphael-school-of-athens.jpg","W":1600,"H":1242,"scale":0.8333333333333334,"lines":{"A":[[635.739,1143.746,602.453,1178.33],[678.26,1138.384,639.672,1184.33],[720.278,1139.184,688.986,1183.194],[753.56,1145.809,732.908,1178.892],[776.248,1152.816,766.215,1171.265],[897.763,1152.073,892.959,1172.516],[925.703,1146.109,919.715,1178.561],[962.538,1139.012,959.413,1186.91],[1006.408,1139.026,1009.085,1186.952],[985.642,1093.999,985.354,1117.998],[1004.792,1094.997,1005.361,1127.992],[1035.481,1100.086,1039.545,1123.74],[1059.229,1104.042,1062.437,1118.695],[1043.304,1146.122,1048.89,1178.647],[1069.898,1152.245,1075.015,1172.612],[1162.033,1103.832,1170.625,1119.649],[1181.957,1100.023,1195.947,1123.116],[1208.944,1095.66,1232.95,1130.124],[1245.589,1096.335,1272.56,1128.532],[1185.735,1152.109,1196.745,1173.435],[1208.758,1146.598,1226.151,1178.117],[1239.699,1140.513,1273.765,1189.905],[1283.433,1142.702,1321.955,1188.703],[710.347,193.381,804.785,394.292],[1272.181,216.345,1190.375,383.401],[608.425,219.919,645.042,263.611],[621.709,140.681,653.329,195.172],[1371.073,244.552,1335.331,288.954],[986.544,1029.538,955.377,1001.386],[1277.23,1101.637,1296.726,1124.44]],"B":[[621.258,139.85,658.802,204.776],[609.503,220.425,647.517,266.846],[710.529,192.755,804.633,400.452],[855.179,485.183,879.299,549.824],[1273.427,214.702,1176.163,410.917],[1275.863,240.859,1185.796,410.422],[1352.08,158.065,1319.657,212.081],[1371.345,244.366,1335.546,288.721],[1120.15,503.063,1096.542,558.223],[635.293,1144.263,601.993,1178.833],[678.587,1137.808,636.288,1188.471],[720.275,1139.184,685.516,1188.09],[753.071,1146.595,732.416,1179.676],[776.729,1151.349,765.661,1172.647],[962.511,1139.02,959.27,1189.916],[1006.399,1139.065,1009.291,1189.983],[1043.301,1146.104,1048.898,1178.626],[1069.89,1152.187,1075.0,1172.556],[1186.446,1152.966,1195.763,1171.787],[1209.184,1147.454,1226.559,1178.984],[1035.66,1101.035,1039.198,1121.736],[1058.775,1102.254,1062.743,1119.812],[1162.031,1103.824,1170.62,1119.643],[1182.538,1100.668,1196.383,1123.848],[1209.475,1096.332,1228.058,1123.608],[1004.792,1094.997,1005.361,1127.992],[1247.281,1098.263,1274.277,1130.438],[1278.289,1102.776,1297.746,1125.608],[1283.9,1143.32,1324.341,1191.627],[321.834,940.18,345.335,935.313],[985.949,1029.149,959.347,1004.896],[1240.418,1141.383,1272.707,1188.356],[1498.168,1165.388,1510.286,1174.23],[1544.08,1158.588,1591.308,1190.503],[1574.45,1150.252,1632.872,1186.964],[925.725,1146.053,919.716,1178.502],[897.667,1152.152,893.624,1169.692]]},"groups":{"A":["floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","ceiling","ceiling","left-wall","left-wall","right-wall","furniture","floor"],"B":["left-wall","left-wall","left-wall","left-wall","right-wall","right-wall","right-wall","right-wall","right-wall","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","floor","other","furniture","floor","floor","floor","floor","floor","floor"]},"sigma":{"A":[0.3429,0.3752,0.3273,0.4514,1.0744,1.106,0.4385,0.3479,0.3852,1.2815,0.4501,0.6249,1.1832,0.4978,0.9097,11.9834,0.5956,0.9517,0.5134,0.7511,0.4598,0.3262,0.3518,0.611,0.775,1.5873,0.3104,0.3592,0.651,0.6694],"B":[0.2879,2.2451,0.6999,2.3061,0.5575,0.2577,0.3025,0.4155,2.023,0.3474,0.3456,0.3113,0.4329,1.49,0.3463,0.3426,0.5289,0.733,0.786,0.5214,0.7957,0.9049,1.4131,0.6784,0.6215,0.4499,0.3971,6.3659,0.3952,0.7775,0.7024,0.3379,1.9574,0.3179,0.3275,0.4688,0.7344]},"tau":8.653587273632041,"tau95":[0.7114006339653454,13.519477291254912],"rms":7.471314833781736,"rms95":[1.0181803070781297,12.078887708440462],"vp":[970.8004232927312,767.710070011092],"tauA":9.307054894361151,"tauB":8.329330310588418,"reader_gap":0.010366188618401703,"by_group":{"ceiling":{"n":2,"tau":null,"vp":null},"floor":{"n":50,"tau":0.744251943949988,"vp":[986.6975916824003,774.6505944865272]},"furniture":{"n":2,"tau":null,"vp":null},"left-wall":{"n":6,"tau":1.2167745202268896,"vp":[893.0936038575085,589.8416189437952]},"other":{"n":1,"tau":null,"vp":null},"right-wall":{"n":6,"tau":0.0,"vp":[1077.874801350196,611.0742878625412]}},"source":{"file":"File:\"The School of Athens\" by Raffaello Sanzio da Urbino.jpg","url":"https://commons.wikimedia.org/wiki/File:%22The_School_of_Athens%22_by_Raffaello_Sanzio_da_Urbino.jpg","license":"Public domain","credit":"Artist: Raphael; Credit: Stitched together from vatican.va"},"true_vp":null,"edges":39,"measurable":true,"share1":0.874262188006901,"share1_95":[0.7576343096529028,0.96867505502899],"share05":0.8489459892811945,"share2":0.9130802027255825,"share1_flat":0.7713108132102995,"share1_A":0.8487890876938737,"share1_B":0.8926000059979482,"vp1":[986.380340032901,780.4732799465162],"points":[{"cum_share":0.874262188006901,"vp":[986.380340032901,780.4732799465162]},{"cum_share":0.9578072152069759,"vp":[998.1160398524916,707.8734410069271]},{"cum_share":1.0,"vp":[1302.0597938778592,1315.8356003600936]}],"notes":{"A":"Worked with zoom from the start; two review runs (the second only added line 39). Marked: the receding edges of the inlaid pavement in the foreground (diagonal strips at left, the frames and inner panels of the two rows of rectangles, the central strip), the top edges of the vault-springing cornices over the front bay on both sides, the side faces of the projecting entablature blocks above the first piers, the impost cornices of the second arch, and the receding top edge of the block Heraclitus leans on (its front face is frontal, so I took it as set square). Not marked: coffers of the barrel vaults (octagon-and-cross pattern, no long straight rib I could follow at 4x), the steps (frontal), pier bases (frontal or hidden by figures), the upper pavement at the top of the stairs (strips under 20 px), Euclid's slate (angled). Rejects: 0 (meant the left edge of the first diagonal strip; snapped onto its right edge = line 1); 24, 25 (right-hand strip edges; green runs diagonally across the strip on a shadow, not on either edge); 27, 29 (meant the lower edge of the vault cornice band; settled on an interior moulding line of the band); 32 (entablature side on the right; green crosses my edge at an angle, onto another moulding); 34, 35, 37 (impost cornices of the second arch; green settled on the curved arch mouldings/rib lines next to them). 36 unsnapped.","B":"Photograph of the whole wall incl. the real dado and door; marked only the fresco. Worked with zoom from the start. Lines: cornices/entablature edges on the side faces of the first piers and the springing cornices of the main and second barrel vaults (left and right), the floor pavement frames and diagonal bands, the right receding cornice edge of the left pedestal (under the book), the top right edge of the block Heraclitus leans on. Review run twice: after run 1 I re-aimed marks 3 and 7 onto the cornice moldings the snap had found, moved 4 and 10 onto the vault-side edge of the crossing cornices (the snap would not take the lower edges; those two lower marks dropped), and added marks 5, 11, 36-43. Rejected: 3 (settled on the edge of 2), 5 (settled on the edge of 0), 11 (settled on an adjacent molding, not the one meant), 13 (settled on the other side of the white band, i.e. line 12), 33 (settled on the lower cornice edge, same as 34), 37 and 41 (settled on transverse band edges). Not marked: the octagonal coffer lattice of the vaults (could not tell reliably which rib segments run straight back), the short capital edges of the far piers, steps (frontal)."}},{"id":"control-photo-1","artist":"Control","title":"Photograph: corridor, Rathaus D\u00fclmen (Dietmar Rabich, CC BY-SA 4.0)","short":"Photo 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Rathaus, 1. Etage -- 2017 -- 9733-9.jpg","url":"https://commons.wikimedia.org/wiki/File:D%C3%BClmen,_Rathaus,_1._Etage_--_2017_--_9733-9.jpg","license":"CC BY-SA 4.0","credit":"Artist: Dietmar Rabich; Credit: Own work"},"true_vp":null,"edges":55,"measurable":true,"share1":0.9911091056251374,"share1_95":[0.9769245617710532,1.0],"share05":0.9306526212610329,"share2":0.9975550717986501,"share1_flat":0.9546573324160497,"share1_A":0.9812471258929598,"share1_B":1.0,"vp1":[779.5556550112809,1233.584674232269],"points":[{"cum_share":0.9911091056251373,"vp":[779.5556550112809,1233.584674232269]},{"cum_share":0.9999999999999999,"vp":[794.9043554067532,1282.6004662463522]}],"notes":{"A":"Photograph through a wooden double-door frame into a corridor. Marked every tile joint running into depth in the near room floor (staggered rows, each row's joint marked separately), the threshold rows and the corridor floor up to about y=1350, the jamb/floor junctions of the big door frame, wall-ceiling junctions of the first three corridor bays, both edges of the central ceiling light track, the right baseboard top and left baseboard top, and top/bottom edges of the two pictures hung flat on the side walls. Unsure: the tops and kick-plate bases of the two open door leaves (open but not certainly at exactly 90 degrees). Mat side edges are hidden behind the door posts, so not marked; far corridor joints beyond y~1300 too soft/small to mark. Marks 60, 61 (reveal/soffit corners of the wooden frame head) are in dark wood and did not snap. Rejects (checked in zoom): 29, 30, 36 snapped onto the base edge of an open door leaf's kick plate, not the adjacent tile joint; 52, 53 snapped onto the vertical edge of a ceiling portal instead of the short wall-ceiling diagonal. Some marks were a few px off (e.g. 7, 37) but snapped onto the intended joint; left as is. One review run.","B":"Photograph looking through a deep wooden door frame into a corridor. Marked from 4x zooms; review run twice (second run only added mark 44). Lines: foreground and middle floor tile joints running into depth (0-16; joints kinked at a row boundary marked as two lines, 3-4), the bottom edges of the door-frame linings where they meet the floor (17, 18, 43), corridor floor joints beyond the mat (19-27), corridor ceiling/wall junctions (29, 30, 39, 40), both edges of the central ceiling beam (31, 32), top and bottom of the framed picture on the right corridor wall (33, 34), heads of two doorway reveals in the corridor (35, 36), top of the right skirting (44). The open door leaves stand at an angle and were not marked; the mat's side edges are hidden. Rejects: 28 (meant the floor/skirting junction on the left, settled on the skirting's top edge); 37, 38, 41, 42 (meant short ceiling/wall junctions in the second and fourth corridor bays, all settled on vertical door/wall edges). Unsure: the two reveal-corner diagonals at the top corners of the door frame, which are soft shading rather than crisp edges. The foreground floor is not a perfectly regular grid (joints kink slightly at row boundaries), as expected from real laid tiles."}},{"id":"control-photo-2","artist":"Control","title":"Photograph: corridor, Edificio Carolino, Puebla (Mario Luna, CC BY-SA 4.0)","short":"Photo 2","date_label":"control","year":null,"region":"control","medium":null,"place":null,"img":"img/control-photo-2.jpg","W":1600,"H":900,"scale":0.6666666666666666,"lines":{"A":[[50.091,1210.291,647.239,1019.128],[51.664,1231.102,647.859,1027.507],[52.145,1264.165,646.257,1045.718],[46.568,1286.877,396.757,1152.742],[50.825,1312.029,645.465,1070.022],[1481.478,936.573,2218.284,1210.278],[1622.182,996.505,2219.05,1232.966],[1604.389,1002.441,2216.735,1264.336],[1523.91,973.349,2212.431,1285.557],[1496.543,968.066,2211.832,1308.103],[638.993,17.196,804.275,245.682],[1675.671,8.4,1552.197,231.513]],"B":[[8.445,1223.866,899.67,937.836],[9.954,1245.372,699.823,1009.742],[8.926,1280.173,901.414,951.743],[14.352,1327.449,894.478,967.201],[1450.507,925.108,2389.844,1273.889],[1624.224,997.318,2248.985,1244.819],[1520.152,965.207,2247.732,1278.091],[1527.641,983.298,2245.892,1324.092],[705.055,13.915,822.209,198.945],[1620.116,10.966,1530.639,194.296],[1676.211,7.484,1568.639,201.68],[661.146,20.701,789.736,205.335],[1508.526,315.991,1452.461,411.791],[1260.413,845.951,1397.177,899.844],[1260.702,852.595,1401.254,920.28],[1068.119,877.56,1101.793,864.831],[1407.894,623.973,1428.559,602.225],[1113.4,866.578,1157.004,846.365],[965.632,467.981,1002.343,519.18],[1415.505,472.371,1391.675,514.038]]},"groups":{"A":["left-wall","left-wall","left-wall","left-wall","left-wall","right-wall","right-wall","right-wall","right-wall","right-wall","left-wall","right-wall"],"B":["left-wall","left-wall","left-wall","left-wall","right-wall","right-wall","right-wall","right-wall","left-wall","right-wall","right-wall","left-wall","right-wall","right-wall","right-wall","left-wall","right-wall","left-wall","left-wall","right-wall"]},"sigma":{"A":[0.2388,0.2388,0.2389,0.2405,0.2392,0.2675,0.2389,0.24,0.2412,0.2399,0.2417,0.2426],"B":[0.2385,0.2387,0.239,0.2414,0.2392,0.239,0.278,0.2398,0.2492,0.2453,0.244,0.2437,0.2926,0.2532,0.2497,0.7115,0.6374,2.0458,0.307,0.3527]},"tau":0.6113784842379746,"tau95":[0.29824840791156787,0.7320022262759609],"rms":0.568434341712282,"rms95":[0.249398270005203,0.7121254254697147],"vp":[1212.577527124983,827.7329469841557],"tauA":0.0,"tauB":0.6741867102177217,"reader_gap":0.00802697939634291,"by_group":{"left-wall":{"n":15,"tau":0.644180827233896,"vp":[1219.8108565684538,822.8246699937778]},"right-wall":{"n":17,"tau":0.37858070981516734,"vp":[1213.4036565382444,829.2665626857631]}},"source":{"file":"File:Pasillos del Edificio Carolino.jpg","url":"https://commons.wikimedia.org/wiki/File:Pasillos_del_Edificio_Carolino.jpg","license":"CC BY-SA 4.0","credit":"Artist: Mario Luna; Credit: Own work"},"true_vp":null,"edges":23,"measurable":true,"share1":0.9959151899537653,"share1_95":[0.9859357074846865,1.0],"share05":0.974709309129594,"share2":1.0,"share1_flat":0.992799002625642,"share1_A":1.0,"share1_B":0.9924433475414357,"vp1":[1210.002984986044,826.0865112518854],"points":[{"cum_share":0.9959151899537652,"vp":[1210.002984986044,826.0865112518854]}],"notes":{"A":"Photograph of a vaulted corridor. Marked the five edges of the painted dado stripe band on each side wall (wall/dark, dark/yellow, yellow/dark, dark/light, light/dado), the floor/dado junction on each side, and the lowest edge of the cornice on each side above the first corbel. The far parts of the stripe bands (left x>650, right x<1480) are only 20-30 px deep for five edges, so they were not marked. The upper cornice mouldings (5-8 px apart) and the short cornice runs between corbels were also left out, because a mark there cannot be told apart from the neighbouring moulding. The vault ribs are transverse arches. Floor junctions 10 and 11 (soft dark-on-dark) did not snap. Three review runs: run 1 had marks 2 and 3 on the same edge (yellow/dark) and mark 4 in the middle of the light stripe, so marks 3 and 4 were moved onto the dark/light and light/dado edges (after run 2, mark 3 was shortened to x<=400, where the edges are further apart). Two left-cornice marks were set at a bad angle and snapped onto one edge together; they were replaced by a single corrected mark on the cornice's lowest line. Final check in zoom: every green line sits on the edge meant, and all five left and five right stripe edges are distinct. No rejects.","B":"Photograph of a vaulted corridor. Marked from zoom (4x) throughout; review run 3 times. Lines: the five edges of the dado stripe band on each side wall (wall/dark, dark/yellow, yellow/dark, dark/light, light/dado), short stripe segments between the far door jambs (24, 26, 22-23 on the right before the right doorway), the head of the right doorway reveal (25), and the wall/vault edges and moulding grooves of the cornices in the first three bays on each side. Run 2: re-placed mark 1 (dark/yellow edge) lower, after it had collapsed onto the wall/stripe edge; it then snapped to its own edge. Re-placed mark 3 (dark/light edge) too, but it still settles on the stronger yellow/dark edge 12-17 px above it: rejected as a duplicate. Right-wall dark/light edge (8) and one cornice mark (30, misplaced on the pier) are unsnapped. Rejects: 3 (on the yellow/dark edge = line 2); 11 (meant the outermost fillet of the left cornice, settled on the thick shadow moulding ~6 px inside); 14 (same shadow line as 11); 16, 17 (meant inner grooves of the right cornice, settled on the same edges as 12 and 13); 18, 19, 20, 28 (meant the outer upper/lower edges of the bay-2/3 cornice, settled on inner moulding grooves). Accepted 15 as an inner moulding groove of the left cornice (placed by eye among the grooves, not on one specific groove). Unsure: the two floor/dado junctions, which are soft shadowed transitions, not crisp edges. Floor has no joints running into depth (only transverse reflections); the vault arches are transverse and not marked."}},{"id":"synthetic-2","artist":"Control","title":"A room drawn by computer to one exact vanishing 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0.0,"vp":[1042.0687454023773,611.6302372437196]},"right-wall":{"n":22,"tau":0.0,"vp":[1041.183201316587,612.3511521166618]}},"source":{"file":null,"url":null,"license":null,"credit":null},"true_vp":[1043.0,612.0],"edges":58,"measurable":true,"share1":1.0,"share1_95":[1.0,1.0],"share05":1.0,"share2":1.0,"share1_flat":1.0,"share1_A":1.0,"share1_B":1.0,"vp1":[1043.567998811699,611.9382778301875],"points":[{"cum_share":1.0,"vp":[1043.567998811699,611.9382778301875]}],"notes":{"A":"Computer-drawn room. Marked: the ceiling rays, the rails on the left and right walls, and the floor lines. Opaque ellipses interrupt several lines, so those are marked as separate segments either side of each ellipse. Stubs under about 30 px between ellipses were not marked. Round 2 (after the addendum): review was rerun once with the new snap settings, no marks changed or added, and reject was rebuilt from scratch in zoom A. Under the wider search, 14 and 25 now snap onto the thick line that runs from the back-wall corner at y~892 down to the floor edge. That corner line is what those marks were meant for (they were drawn with the wrong slope), so they are kept. Rejected: 15 and 26, which settled on the same floor lines as 29 and 44 (duplicates, not the edges meant). All 46 marks snapped.","B":"Line drawing of a box room: marked the 7 ceiling lines running to the back wall, the receding wall lines on both side walls (split where an ellipse covers them), and the floor joints running into depth including both wall-floor junctions (17 left; 27, a short stretch near the right corner). Transversals and the vertical posts were not marked. The two heavy lines, one on each side wall, are drawn visibly thicker than every other line, so it is unclear whether they depict the same kind of edge: they are under unsure (the right one as two segments on either side of the pale blue ellipse). Review was rerun once: mark 27 was first placed along a line that turned out not to exist (unsnapped) and was re-placed on the junction at the right corner, and mark 37 was moved about 15 px onto its line. All 40 green lines sit on the line meant; nothing rejected. Round 2: marks unchanged; review rerun once with the new snap parameters (40 of 40 snapped); every green line checked in six 700 px zoom views and each lies on the drawn line meant, so reject rebuilt as empty. The heavy lines stay under unsure."}}]}