Macbeth color checker swatch values

D50 Lab values from BabelColor
averaged measured spectral values
from multiple test runs.
http://www.babelcolor.com/index_htm_files/RGB%20Coordinates%20of%20the%20Macbeth%20ColorChecker.pdf

NOTE for this sRGB-oriented comparison,
the cyan patch is reduced in chroma to bring it within sRGB gamut
(desat_cyan) before the rest of the conversions are done.

pso is FOGRA51 cmyk
TAC: 300% GCR: Medium  Max black: 96% Black start: 10% TVI: CMYK 16%
Sheet-fed and heat-set web offset printing according to ISO 12647-2:2013 on Premium Coated stock (Printing Substrate 1)
xicclu -fb -ir PSOcoated_v3.icc

sRGB is sRGB calculated from D50 Lab with chromatic adaptation to D65;
given as float 0.0-1.0 and as integer 8bit, in decimal

nRGB is naive conversion of pso cmyk values to sRGB.

lab2 is CMYK values converted back to lab
xicclu -ff -ir PSOcoated_v3.icc

sRGB2 is lab2 converted to sRGB.

f39 is FOGRA39 CMYK
TAC 300%
xicclu -fb -ir Coated_Fogra39L_VIGC_300.icc

dE2 is DeltaE 2000 between sRGB and sRGB2 (CMYK round-trip error)

gRGB is f39 CMYK converted to sRGB with PDFium AdobeCMYK_to_sRGB

gdE is DeltaE 2000 between sRGB and gRGB
the DeltaE 2000 between lab and sRGB is 0.00 in all cases
(the desaturated lab, for the cyan)

sample calculation:

mr_lab=[51.711, 47.694, 16.857]
Array(3) [ 51.711, 47.694, 16.857 ]

mr_lch=Lab_to_LCH(mr_lab)
Array(3) [ 51.711, 50.58533468308775, 19.46548035000572 ]

mr_srgb=LCH_to_sRGB(mr_lch)
Array(3) [ 0.782365578265228, 0.3299609364735502, 0.38206099086629175 ]

mr_cmyk=[0.095888, 0.773688, 0.462167, 0.120127]
Array(4) [ 0.095888, 0.773688, 0.462167, 0.120127 ]

mr_n=naive_CMYK_to_sRGB(mr_cmyk)
Array(3) [ 0.795503737776, 0.19912581837599996, 0.473224735209 ]

========================= data below ========================

row 1

dark skin
lab     38.358 13.802 14.646
lch     38.358, 20.124624716997833, 46.6993622491831
sRGB    0.45870209092590125, 0.32007132252023746, 0.26381334009797147
        117 82 67
pso     0.324832 0.599138 0.602548 0.485780
f39     0.204222 0.534465 0.568083 0.584089
nRGB    0.34718488896, 0.20613125764000007, 0.20437776744000002
ndE     11.33
lab2    38.355787 13.718771 14.634213
sRGB2   0.4582187372166619, 0.32026895559707236, 0.2638486736088391
dE2     0.06
gRGB    0.411765,0.266667,0.207843
gdE     4.61

light skin
lab     66.056 17.737 17.848
lch     66.056 25.16251722304428 45.17872167764671
sRGB    0.7801707995054818, 0.5819574034194599, 0.5077367244326566
        199 148 129
pso     0.163688 0.432714 0.425879 0.092646
f39     0.122705 0.419838 0.426357 0.158770
nRGB    0.7588310384479999 0.514729221244 0.520930985834
ndE     9.36
lab2    66.129284 17.669899 17.807828
sRGB2   0.7805176035161692, 0.5829073185641944, 0.5087401105289944
dE2     0.07
gRGB    0.745098,0.537255,0.466667
gdE     3.42

blue sky
lab     50.090  -4.407 -22.51
lch     50.09 22.937343983120627 258.92276283824305
sRGB    0.35861374256727024 0.4806652888422717 0.6165556939500282
        91 123 157
pso     0.668291 0.411277 0.141541 0.149605
f39     0.631933 0.359941 0.106092 0.260416
nRGB    0.282083675055, 0.500647095585, 0.730029241305
ndE     5.66
lab2    50.117317 -4.421669 -22.509928
sRGB2   0.35875115219527526, 0.48096599854692784, 0.6168384685511774
dE2     0.03
gRGB    0.309804,0.447059,0.580392
gdE     3.76

foliage
lab     43.204 -13.464 21.73
lch     43.204 25.5631022374046 121.78253045403237
sRGB    0.3495819784053142 0.4234457970321011 0.2542085775554397
        89 108 65
pso     0.554549 0.256601 0.759120 0.456182
f39     0.500543 0.152431 0.741138 0.547711
nRGB    0.24224427191800002, 0.404273757382, 0.13099487984000002
ndE     7.52
lab2    43.247288 -13.473697 21.727580
sRGB2   0.3499226420099233, 0.4238844849496026, 0.25461719810452926
dE2     0.04
gRGB    0.278431,0.380392,0.215686
gdE     5.00

blue flower
lab     55.356   8.891 -24.82
lch     55.356 26.36441315485706 289.7084979581484
sRGB    0.5129520005814212 0.5041314384420632 0.6891861857957071
        131 129 176
pso     0.549989 0.491789 0.062328 0.024350
f39     0.521836 0.470595 0.031484 0.117416
nRGB    0.43905323215000003, 0.49583606215, 0.9148396867999999
ndE     12.39
lab2    55.407536 8.848533 -24.786018
sRGB2   0.5132734852465152, 0.5047422707613722, 0.6894986443758445
dE2     0.06
gRGB    0.462745,0.466667,0.662745
gdE     4.12

bluish green
lab     70.700 -32.892 -0.24
lch     70.7, 32.8928755811954, 180.4180573712323
sRGB    0.3687923577561622, 0.7436846055136055, 0.6747488404682519
        94 190 172
pso     0.619655 0.000000 0.384641 0.000000
f39     0.633690 0.000000 0.408456 0.000000
nRGB    0.38034500000000004, 1, 0.615359
ndE     21.58
lab2    70.628876 -32.567650 -0.106069
sRGB2   0.372989512735539, 0.7423372172978121, 0.6730831350137813
dE2     0.17
gRGB    0.313726,0.752941,0.670588
gdE     1.76

row 2

orange
lab     62.559 35.135 58.050
lch     62.559, 67.85477672942413, 58.81540553823881
sRGB    0.8737289596078436, 0.48743013287545317, 0.17203723560187653
        223 124 44
pso     0.030043 0.574539 0.912639 0.073987
f39     0.003757 0.578048 0.920334 0.095832
nRGB    0.898192791441, 0.39398241699299996, 0.08089742169300007
ndE     6.40
lab2    62.577187 35.127123 57.970828
sRGB2   0.8738681678776227, 0.4876500343386742, 0.17299853216999808
dE2     0.03
gRGB    0.874510,0.482353,0.168627
gdE     0.41

purplish blue
lab     40.178   9.551 -44.289
lch     40.178, 45.307142063917475, 282.16956757875397
sRGB    0.27056023971670246, 0.36068663956511976, 0.6579706647059643
        69 92 168
pso     0.844520 0.680119 0.000000 0.000000
f39     0.840644 0.670839 0.000000 0.000000
nRGB    0.15547999999999995, 0.31988099999999997, 1
ndE     8.79
lab2    39.528723 8.485752 -42.112271
sRGB2   0.2672365291065321, 0.35634121892764137, 0.6366766805131686
dE2     0.75 (!)
gRGB    0.227451,0.380392,0.678431
gdE     3.44

moderate red
lab     51.711 47.694 16.857
lch     51.711, 50.58533468308775, 19.46548035000572
sRGB    0.782365578265228, 0.3299609364735502, 0.38206099086629175
        200 84 97
pso     0.095888 0.773688 0.462167 0.120127
f39     0.021308 0.765123 0.435755 0.191336
nRGB    0.795503737776, 0.19912581837599996, 0.473224735209
ndE     11.77
lab2    51.746686 47.576278 16.846156
sRGB2   0.7821732524867637, 0.3308898756914544, 0.38243679535004477
dE2     0.05
gRGB    0.772549,0.313726,0.364706
gdE     1.30

purple
lab     30.375 21.131 -20.30
lch     30.375, 29.30203339360598, 316.14905286918514
sRGB    0.3602612680842865, 0.23316052206020216, 0.40644889811705104
        92 59 104
pso     0.672001 0.844106 0.160514 0.315601
f39     0.616052 0.791967 0.071197 0.427333
nRGB    0.22448218760100003, 0.10669369770600001, 0.574543378914
ndE     17.16
lab2    30.411496 21.061348 -20.318246
sRGB2   0.3601681773047287, 0.2337026527115698, 0.40690694991553045
dE2     0.06
gRGB    0.305882,0.184314,0.392157
gdE     4.91

yellow green
lab     72.492 -23.462 57.07
lch     72.492, 61.70454070811969, 112.34801292482507
sRGB    0.6237512399897851, 0.7401843871288837, 0.2479420452626609
        159 189 63
pso     0.403959 0.032823 0.879513 0.060450
f39     0.431908 0.017645 0.900370 0.072336
nRGB    0.56001032155, 0.90871115035, 0.11320356085000005
ndE     11.91
lab2    72.508214 -23.408051 57.073785
sRGB2   0.6243402679456442, 0.7402564895470182, 0.2481094860598959
dE2     0.03
gRGB    0.572549,0.741176,0.282353
gdE     3.41

orange yellow
lab     71.963 19.486 67.998
lch     71.963, 70.73494327416967, 74.0094313244772
sRGB    0.9046813185631295, 0.633661174512058, 0.15251462577238098
        231 162 39
pso     0.026882 0.373528 0.917099 0.064206
f39     0.013742 0.382738 0.930336 0.080467
nRGB    0.9106379856919999, 0.586248738768, 0.07757825839400001
ndE     3.97
lab2    71.988196 19.474792 67.954180
sRGB2   0.9048940271975158, 0.6339596890612941, 0.15339352561401925
dE2     0.02
gRGB    0.894118,0.607843,0.156863
gdE     2.22

row 3

blue
lab     28.653 15.600 -50.52
lch     28.653, 52.87372126113312, 287.160091652553
sRGB    0.15434596195192993, 0.24382769404212812, 0.577067166400983
        39 62 147
pso     1.000000 0.846365 0.000000 0.000000 <- out of cmyk gamut
f39     1.000000 0.860826 0.000086 0.000000 <- out of cmyk gamut
nRGB    0, 0.15363499999999997, 1
ndE     12.1
lab2    30.757057 13.043556 -46.247492
sRGB2   0.1885077418085538, 0.2669630435260571, 0.5716433494042713
dE2     1.9 because of CMYK gamut mapping
gRGB    0.105882,0.270588,0.611765
gDE     3.45

green
lab     55.046 -38.088 31.61
lch     55.046, 49.496341723404164, 140.31003467778154
sRGB    0.2638932762091318, 0.5813842341831656, 0.2868628888000584
        67 148 73
pso     0.713157 0.070127 0.861648 0.155189
f39     0.716577 0.010590 0.868547 0.218896
nRGB    0.242328121673, 0.785566939003, 0.11688129147199999
ndE     17.00
lab2    55.076474 -38.063910 31.653426
sRGB2   0.2646462627318877, 0.5816644325835935, 0.2868280450381334
dE2     0.04
gRGB    0.192157,0.584314,0.298039
gdE     2.18

red
lab     42.182 54.893 28.785
lch     42.182, 61.982398098169774, 27.671788697910042
sRGB    0.713817099436228, 0.18067207842425287, 0.22093013045788767
        182 46 56
pso     0.057877 0.955528 0.744658 0.237287
f39     0.003043 0.936976 0.709326 0.274589
nRGB    0.718569459699, 0.03391937253599997, 0.194752662846
ndE     3.38
lab2    42.245669 54.914956 28.770983
sRGB2   0.7146677910900988, 0.18129201804963102, 0.22158169573232422
dE2     0.06
gRGB    0.709804,0.121569,0.203922
gdE     2.01

yellow
lab     82.230   4.048 79.844
lch     82.23, 79.94654864345301, 87.09765413971907
sRGB    0.9404835651314826, 0.7835709856805116, 0.08810062284962886
        240 200 22
pso     0.022256 0.158332 0.932802 0.056649
f39     0.033382 0.172587 0.948189 0.052197
nRGB    0.922355780144, 0.793988349468, 0.06339130049800001
ndE     1.94
lab2    82.274025 4.002809 79.974855
sRGB2   0.9407993645532297, 0.7841539475893631, 0.08566175584729577
dE2     0.05
gRGB    0.925490,0.764706,0.149020
gdE     1.61

magenta
lab     51.820 49.787 -13.90
lch     51.82, 51.690960225168965, 344.4008329076339
sRGB    0.7557397317132898, 0.32885676834031397, 0.5847761463440625
        193 84 149
pso     0.234213 0.793246 0.022206 0.012446
f39     0.219151 0.791049 0.006654 0.054204
nRGB    0.756256014998, 0.20418073971600004, 0.965624375876
ndE     18.08
lab2    51.838108 49.793529 -13.890209
sRGB2   0.7559961335162456, 0.3290130166090527, 0.5848995185260243
dE2     0.02
gRGB    0.725490,0.321569,0.596078
gdE     2.45

cyan
lab     50.555 -27.973 -28.13
lch     50.555 39.67734933182911 225.1695015620979
desat_cyan
lch     50.555 33.7 225.1695015620979
lab     50.555 -23.758898108744773 -23.89989039008933
sRGB    0.0009044016966127655 0.5205697664872857 0.6288076105046994
        0 133 160
pso     0.797136 0.159738 0.165963 0.237161
f39     0.786995 0.145292 0.174643 0.266541
nRGB    0.15475257089600003, 0.6409846238179999, 0.636235951043
ndE     14.97
lab2    50.577208 -23.813859 -24.002466
sRGB2   -0.005719132979570607, 0.5209048947566058, 0.6297264649129999
dE2     0.05
gRGB    0.043137,0.505882,0.603922
gdE     1.54

row 4

white 9.5 (.05 D)
lab     96.387  -0.404   2.238
lch     96.387, 2.274172376931881, 100.23273666083813
sRGB    0.9617491586334798, 0.9596837804789503, 0.9420309128191856
        245 245 240
pso     0.042452 0.031800 0.055804 0.000000
f39     0.045478 0.031057 0.066461 0.000000
nRGB    0.957548, 0.9682, 0.944196
ndE     1.89
lab2    96.398996 -0.425662 2.241989
sRGB2   0.9617244417454606, 0.9598717556997672, 0.9421314655249645
dE2     0.03
gRGB    0.949020,0.945098,0.925490
gdE     0.82

neutral 8 (.23 D)
lab     81.014  -0.570   0.180
lch     81.014, 0.5977457653551382, 162.47443162627712
sRGB    0.7848759799508187, 0.7900901105897526, 0.787351861664225
        200 201 201
pso     0.222900 0.158683 0.159239 0.025770
f39     0.245503 0.169889 0.190266 0.021639
nRGB    0.7570741329999999, 0.8196362609100001, 0.81909458903
ndE     6.56
lab2    81.097257 -0.584252 0.134028
sRGB2   0.7855533776779254, 0.7910373765997412, 0.7885906000898528
dE2     0.08
gRGB    0.733333,0.752941,0.752941
gdE     3.19

neutral 6.5 (.44 D)
lab     66.297  -0.434 -0.079
lch     66.297, 0.44113149966874954, 190.3164636177376
sRGB    0.6285501894340038, 0.6329284759216435, 0.632407706965441
        160 161 161
pso     0.356944 0.272657 0.260496 0.114909
f39     0.317112 0.237954 0.248371 0.208352
nRGB    0.569163078096, 0.643764743213, 0.6545283348640001
ndE     7.85
lab2    66.317275 -0.432188 -0.054450
sRGB2   0.6288354649705368, 0.6331318685228658, 0.6324472762315926
dE2     0.03
gRGB    0.572549,0.584314,0.588235
gdE     4.18

neutral 5 (.70 D)
lab     50.830  -0.687 -0.268
lch     50.83, 0.7374232163418779, 201.3108507096969
sRGB    0.4691121777258797, 0.4760603564968741, 0.47621104289127564
        120 121 121
pso     0.477445 0.383105 0.349081 0.289582
f39     0.346517 0.263343 0.268701 0.464599
nRGB    0.37123247799000003, 0.43825331211000007, 0.462424574142
ndE     8.76
lab2    50.817427 -0.700608 -0.287514
sRGB2   0.4688462175707377, 0.4759681013575035, 0.4762143055769343
dE2     0.03
gRGB    0.411765,0.423529,0.427451
gdE     5.45

neutral 3.5 (1.05 D)
lab     35.724  -0.521 -0.468
lch     35.724, 0.7003320640953119, 221.93248294171104
sRGB    0.32496296405417696, 0.33053531849566803, 0.3322574333971765
        83 84 85
pso     0.577187 0.473918 0.412416 0.524124
f39     0.419185 0.328176 0.313476 0.667397
nRGB    0.2012065591879999, 0.25034979783199995, 0.2796171235839999
ndE     9.82
lab2    35.746030 -0.543022 -0.484248
sRGB2   0.32498560042425684, 0.33078694025010386, 0.33256070783141206
dE2     0.04
gRGB    0.262745,0.274510,0.286275
gdE     5.24

black 2 (1.5 D)
lab     20.706   0.025   -0.447
lch     20.706, 0.44769855930078667, 273.2011270261488
sRGB    0.19462750886077482, 0.1953957463070961, 0.1979475537592461
        50 50 50
pso     0.693063 0.595110 0.469317 0.802219
f39     0.525847 0.433151 0.389007 0.865985
nRGB    0.060706306796999954, 0.08007954909000004, 0.10495901442300004
ndE     10.29
lab2    20.542248 -0.102405 0.326121
sRGB2   0.19402330545665936, 0.19413204024565262, 0.19210302241366276
dE2     0.80 (!)
gRGB    0.101961,0.109804,0.125490
gdE     7.38


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