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{ RCSid $Id$ } |
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{ |
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Macbeth color checker chart. |
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Creates four rows of 6 color squares each. |
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Color order, starting from lower left and reading right then up: |
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|
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Color x y Y (CIE 1931 under Illuminant C) |
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===== ===== ===== ===== |
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DarkSkin .4002 .3504 10.05 |
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LightSkin .3773 .3446 35.82 |
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BlueSky .2470 .2514 19.33 |
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Foliage .3372 .4220 13.29 |
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BlueFlower .2651 .2400 24.27 |
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BluishGreen .2608 .3430 43.06 |
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Orange .5060 .4070 30.05 |
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PurplishBlue .2110 .1750 12.00 |
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ModerateRed .4533 .3058 19.77 |
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Purple .2845 .2020 6.56 |
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YellowGreen .3800 .4887 44.29 |
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OrangeYellow .4729 .4375 43.06 |
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Blue .1866 .1285 6.11 |
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Green .3046 .4782 23.39 |
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Red .5385 .3129 12.00 |
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Yellow .4480 .4703 59.10 |
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Magenta .3635 .2325 19.77 |
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Cyan .1958 .2519 19.77 |
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White .3101 .3163 90.01 |
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Neutral.8 .3101 .3163 59.10 |
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Neutral.65 .3101 .3163 36.20 |
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Neutral.5 .3101 .3163 19.77 |
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Neutral.35 .3101 .3163 9.00 |
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Black .3101 .3163 3.13 |
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} |
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xres : 512; { settable x resolution } |
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gap : xres/64; { gap between patches } |
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biggap : 16+gap; |
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pwidth : (xres-gap)/6 - gap; { patch width } |
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pheight : pwidth; |
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yres : pheight*4 + biggap*4 + gap; { for square patches } |
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gapgrey : 0; { value for gap pixels } |
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or(a,b) : if( a, a, b ); |
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and(a,b) : if( a, b, a ); |
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mod(n,d) : n - floor(n/d)*d; |
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|
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ingap = if(or(gap-mod(x,pwidth+gap),biggap-mod(y,pheight+biggap)), 1, -1); |
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|
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ro = if(ingap, gapgrey, redval); |
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go = if(ingap, gapgrey, grnval); |
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bo = if(ingap, gapgrey, bluval); |
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|
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{ Patches are numbered starting from 0 at the upper left, English order } |
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|
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n = floor(x/(pwidth+gap)) + 6*floor((yres-1-y)/(pheight+biggap)); |
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|
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{ The following were computed from the published CIE 1931 XYZ values |
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using the following definitions of the three primaries and white: |
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|
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Color x y |
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===== = = |
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Red .640 .330 |
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Green .290 .600 |
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Blue .150 .060 |
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White .333 .333 |
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|
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redval=select(n+1,0.1486842,0.4729399,0.1079659,0.08712918, |
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0.2051028,0.1392646,0.5821536,0.06337776,0.4590441,0.09402137, |
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0.319248,0.6564189,0.02655103,0.06694206,0.3670574,0.7136942, |
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0.425348,0,0.7898659,0.5186209,0.3176663,0.1734879,0.07897781, |
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0.02746673); |
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grnval=select(n+1,0.08463139,0.3204288,0.2051882,0.1576957, |
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0.2280522,0.5390015,0.2154359,0.1079601,0.09839423,0.0426486, |
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0.5293968,0.3799829,0.04445694,0.3150952,0.02880633,0.5982432, |
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0.09023558,0.2530342,0.925279,0.6075324,0.3721264,0.2032304, |
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0.09251762,0.03217557); |
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bluval=select(n+1,0.06746537,0.2793655,0.4195167, |
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0.06372649,0.5480446,0.5015115,0.02782678,0.47622,0.1554321, |
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0.1866896,0.05423259,0.0301096,0.3746091,0.07726951,0.05228816, |
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0.01403399,0.3776974,0.4719555,1.090738,0.7161716,0.4386702, |
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0.2395721,0.1090617,0.03792922); |
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} |
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|
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{ The following were computed from measured spectra, using same primaries: } |
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|
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redval = select(n+1, 0.168584, 0.633823, 0.118789, 0.071288, 0.271119, |
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0.160804, 0.699359, 0.076245, 0.599413, 0.113352, |
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0.325668, 0.745543, 0.037489, 0.056075, 0.537591, |
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0.834969, 0.568191, 0.008597, 0.91942, 0.602537, |
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0.36137, 0.201045, 0.088912, 0.030925); |
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grnval = select(n+1, 0.069446, 0.337209, 0.19066, 0.131171, 0.219394, |
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0.492803, 0.257105, 0.089464, 0.112735, 0.032193, |
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0.50756, 0.415383, 0.03581, 0.301005, 0.025739, |
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0.639189, 0.094541, 0.207922, 0.918992, 0.606277, |
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0.36625, 0.200417, 0.0877122, 0.03085); |
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bluval = select(n+1, 0.031966, 0.252572, 0.344106, 0.025464, 0.455498, |
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0.436593, 0.003501, 0.366442, 0.126229, 0.129459, 0.04907, |
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0.005622, 0.293019, 0.071808, 0.037301, 0, 0.303893, |
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0.395988, 0.884604, 0.596902, 0.360222, 0.195084, |
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0.0852725, 0.030359); |
