[argyllcms] Re: How do I force dispcal to always map R0 B0 G0 -> R0 B0 G0 on the calibrated video LUT?

  • From: Alexander <adfirestone@xxxxxxxxx>
  • To: argyllcms <argyllcms@xxxxxxxxxxxxx>
  • Date: Tue, 22 Dec 2009 23:33:06 -0800

>
> Why don't you try the adaptive mode and see what you
> think:
>
>        spotread -e
>
> vs. display mode:
>
>        spotread -d
>

spotread -e appears to fluctuate less than half as much as spotread -d over
multiple readings, which is excellent. I'm definitely looking forward to
trying out dispcal -V when RC3 is released.

The measurements between the two modes differ a bit though. Should I be
assuming that the spotread -e measurements are more correct than the
spotread -d measurements?

Below are multiple measurements of the same gray patch on my CRT (set to
2048x1536 @85Hz / ~85cd/m2 white / ~0.01cd/m2 black) with an uncalibrated
video lut:
___
spotread -v -d -yc -x -T -H

Reading   X            Y            Z            L*           a*
b*
1     11.385368    11.933579    12.589819    41.110359    -0.865849
-8.415407
2     11.465612    12.003917    12.558366    41.222345    -0.773605
-8.133249
3     11.499383    12.029145    12.567092    41.262404    -0.705105
-8.088909
4     11.450737    11.980537    12.620115    41.185171    -0.719744
-8.372087
5     11.449435    11.985335    12.564145    41.192804    -0.761962
-8.200560
6     11.457127    11.990830    12.549232    41.201542    -0.744604
-8.143217
7     11.461047    12.015407    12.569253    41.240596    -0.884907
-8.132631
8     11.411588    11.970802    12.626468    41.169677    -0.933366
-8.416747
9     11.411379    11.955226    12.560909    41.144870    -0.827937
-8.274033
10    11.443727    11.980261    12.542866    41.184732    -0.768016
-8.154145
11    11.471549    12.004843    12.583372    41.223816    -0.737510
-8.201547
12    11.410118    11.958588    12.541217    41.150227    -0.860074
-8.208959
13    11.402592    11.945061    12.601543    41.128671    -0.821140
-8.417003
14    11.466131    11.998777    12.531636    41.214177    -0.734685
-8.071510
15    11.491702    12.017116    12.577710    41.243310    -0.677616
-8.151906
16    11.500448    12.021237    12.558054    41.249853    -0.643410
-8.084936
17    11.446169    11.969853    12.564955    41.168166    -0.679139
-8.245332
18    11.475452    12.015188    12.552893    41.240248    -0.780454
-8.086864
19    11.419181    11.968960    12.557262    41.166744    -0.866289
-8.225982
20    11.456639    11.987967    12.563702    41.196989    -0.728469
-8.192089
21    11.416860    11.967780    12.545361    41.164866    -0.874835
-8.195473
22    11.470056    12.012681    12.564989    41.236267    -0.801848
-8.128015

Avg   11.448286    11.986959    12.567771    41.195356    -0.781389
-8.206391
Min   11.385368    11.933579    12.531636    40.110359    -0.933366
-8.417003
Max   11.500448    12.029145    12.626468    41.262404    -0.643410
-8.071510
Diff   0.115080     0.095566     0.094832     1.152045    -0.289956
-0.345493

Avg CCT  = 6202.364K (Delta E 3.072067)
Min CCT  = 6162K (Delta E 2.780746)
Max CCT  = 6260K (Delta E 3.377782)
Min/Max Diff CCT =  98K

Avg Closest Planckian temperature  = 6082.318K (Delta E 2.700744)
Min Closest Planckian temperature  = 6055K (Delta E 2.442226)
Max Closest Planckian temperature  = 6125K (Delta E 2.973022)
Min/Max Diff Closest Planckian temperature =  70K

Avg Closest Daylight temperature  = 6232.682K (Delta E 0.644515)
Min Closest Daylight temperature  = 6204K (Delta E 0.909343)
Max Closest Daylight temperature  = 6277K (Delta E 0.362912)
Min/Max Diff Closest Daylight temperature =  73K

Avg Color Rendering Index (Ra) = 83.268
Min Color Rendering Index (Ra) = 83.1
Max Color Rendering Index (Ra) = 83.5

___


spotread -v -e -yc -x -T -H

Reading   X            Y            Z            L*           a*
b*
1     11.127534    11.687459    12.268175    40.715012    -1.027611
-8.178978
2     11.122443    11.670905    12.226275    40.688221    -0.949266
-8.104396
3     11.115179    11.665672    12.239640    40.679747    -0.965734
-8.157560
4     11.129284    11.680509    12.265267    40.703768    -0.966385
-8.189992
5     11.124922    11.672392    12.263009    40.690630    -0.941561
-8.206141
6     11.113352    11.674539    12.246633    40.694105    -1.040960
-8.152966
7     11.109718    11.669460    12.252528    40.685882    -1.032039
-8.184133
8     11.118328    11.669163    12.248518    40.685401    -0.967134
-8.173407
9     11.153881    11.708999    12.268300    40.749832    -0.985721
-8.119303
10    11.129976    11.690743    12.262089    40.720323    -1.032697
-8.152294
11    11.115686    11.665345    12.230382    40.679219    -0.959763
-8.131768
12    11.116037    11.674822    12.250933    40.694562    -1.023334
-8.164571
13    11.154603    11.704901    12.250344    40.743211    -0.951923
-8.078995
14    11.151099    11.703285    12.250650    40.740599    -0.966180
-8.084383
15    11.128853    11.680527    12.229956    40.703795    -0.969646
-8.088165
16    11.155852    11.705367    12.270767    40.743963    -0.946078
-8.136523
17    11.118246    11.666609    12.227647    40.681265    -0.949900
-8.120348
18    11.135507    11.688195    12.266027    40.716202    -0.974609
-8.170741
19    11.115829    11.666887    12.215730    40.681716    -0.969484
-8.085174
20    11.135893    11.685715    12.251293    40.712190    -0.954505
-8.135216
21    11.132864    11.685849    12.252020    40.712406    -0.977518
-8.136939
22    11.143205    11.694606    12.261082    40.726570    -0.963210
-8.138623

Avg   11.129467    11.682361    12.249876    40.706755    -0.977966
-8.140483
Min   11.109718    11.665345    12.215730    40.679219    -1.040960
-8.206141
Max   11.155852    11.708999    12.270767    40.749832    -0.941561
-8.078995
Diff   0.046134     0.043654     0.055037     0.070613    -0.099399
-0.127146


Avg CCT  = 6229.409K (Delta E 3.540111)
Min CCT  = 6214K (Delta E 3.492441)
Max CCT  = 6242K (Delta E 3.646528)
Min/Max Diff CCT =  28K

Avg Closest Planckian temperature  = 6090.545K (Delta E 3.115163)
Min Closest Planckian temperature  = 6079K (Delta E 3.100537)
Max Closest Planckian temperature  = 6101K (Delta E 3.218328)
Min/Max Diff Closest Planckian temperature =  22K

Avg Closest Daylight temperature  = 6240.227K (Delta E 0.228476)
Min Closest Daylight temperature  = 6229K (Delta E 0.243896)
Max Closest Daylight temperature  = 6251K (Delta E 0.121533)
Min/Max Diff Closest Daylight temperature =  22K

Avg Color Rendering Index (Ra)  = 83.409
Min Color Rendering Index (Ra)  = 83.3
Max Color Rendering Index (Ra)  = 83.5

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