[argyllcms] Re: Calibrating problems in darks areas
- From: Frédéric Mantegazza <frederic.mantegazza@xxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Fri, 28 Dec 2007 21:39:29 +0100
On jeudi 27 décembre 2007, lee scratchy wrote:
> "dispcal -v -yc -t6500 -gl -qh test"
>
> and really work on the precalibration options from 1>4 ;)
Ok, here are the results (see below). As the A901HT don't have RGB offset
adjustement, I can't get a very good black point. And I still have banding
effects...
And with this adjustement, white seems to have a red color cast. Is it
another hardware problem?
$ dispcal -v -d 2,1 -y c -t6500 -gl -qh A901HT
Setting up the instrument
Place instrument on test window.
Hit Esc, ^C or Q to give up, any other key to continue:
Display type is CRT
Target white = 6500.000000 degrees kelvin Daylight spectrum
Target brightness = native brightness
Target gamma = L* curve
Display adjustment menu:
Press 1 .. 7
1) Black level (CRT: Brightness)
2) White point (Color temperature, R,G,B, Gain)
3) White level (CRT: Contrast, LCD: Brightness)
4) Black point (R,G,B, Offset)
5) Check all
6) Continue on to calibration
7) Exit
Doing some initial measurements
Adjust CRT brightness to get target level. Press space when done.
Target 1.14
\ Current 1.16 -
Press 1 .. 7
1) Black level (CRT: Brightness)
2) White point (Color temperature, R,G,B, Gain)
3) White level (CRT: Contrast, LCD: Brightness)
4) Black point (R,G,B, Offset)
5) Check all
6) Continue on to calibration
7) Exit
Doing some initial measurements
Adjust R,G & B gain to get target x,y. Press space when done.
Target B 112.09, x 0.3128, y 0.3291
\ Current B 109.74, x 0.3131, y 0.3300 DE 0.6 R- G-- B+
Press 1 .. 7
1) Black level (CRT: Brightness)
2) White point (Color temperature, R,G,B, Gain)
3) White level (CRT: Contrast, LCD: Brightness)
4) Black point (R,G,B, Offset)
5) Check all
6) Continue on to calibration
7) Exit
Doing some initial measurements
Adjust CRT Contrast or LCD Brightness to desired level. Press space when
done.
Initial 109.66
\ Current 109.74
Press 1 .. 7
1) Black level (CRT: Brightness)
2) White point (Color temperature, R,G,B, Gain)
3) White level (CRT: Contrast, LCD: Brightness)
4) Black point (R,G,B, Offset)
5) Check all
6) Continue on to calibration
7) Exit
Doing some initial measurements
Adjust R,G & B offsets to get target x,y. Press space when done.
Target B 1.10, x 0.3128, y 0.3291
/ Current B 1.40, x 0.2809, y 0.3575 DE 22.0 R+ G-- B+
Press 1 .. 7
1) Black level (CRT: Brightness)
2) White point (Color temperature, R,G,B, Gain)
3) White level (CRT: Contrast, LCD: Brightness)
4) Black point (R,G,B, Offset)
5) Check all
6) Continue on to calibration
7) Exit
Commencing device calibration
patch 6 of 6
Black = XYZ 0.39 0.44 0.56
Red = XYZ 51.60 27.75 2.90
Green = XYZ 36.51 76.75 13.52
Blue = XYZ 20.95 10.65 109.08
White = XYZ 104.16 109.82 118.94
patch 80 of 80
Initial native brightness target = 109.821478 cd/m^2
Had to scale brightness from 109.821478 to 109.155734 to fit within gamut
Target white value is XYZ 103.750160 109.155734 118.804211
Adjusted target black XYZ 0.42 0.44 0.48, Lab 3.64 0.00 0.00
Target black after min adjust: XYZ 0.49 0.52 0.56, Lab 4.29 0.00 0.00
Current gamma curve offset = 0.137862, Gamma curve power = 2.703782
Total Iteration 4, Final Samples = 96 Final Repeat threshold = 0.500000
Creating initial calibration curves...
Doing iteration 1 with 12 sample points and repeat threshold of 4.000000 DE
patch 12 of 12
Brightness error = -1.057560 cd/m^2
White point error = 0.105273 deltaE
Maximum neutral error (@ 0.242624) = 1.764902 deltaE
Average neutral error = 0.925211 deltaE
Computing update to calibration curves...
Doing iteration 2 with 24 sample points and repeat threshold of 2.000000 DE
patch 24 of 24
Brightness error = -1.449498 cd/m^2
White point error = 0.662965 deltaE
Maximum neutral error (@ 0.057750) = 1.425828 deltaE
Average neutral error = 0.871021 deltaE
Computing update to calibration curves...
Doing iteration 3 with 48 sample points and repeat threshold of 1.000000 DE
patch 48 of 48
Brightness error = 1.133949 cd/m^2
White point error = 0.548879 deltaE
Maximum neutral error (@ 0.688472) = 0.998333 deltaE
Average neutral error = 0.590139 deltaE
Computing update to calibration curves...
Doing iteration 4 with 96 sample points and repeat threshold of 0.500000 DE
patch 96 of 96
Brightness error = -0.348474 cd/m^2
White point error = 0.464447 deltaE
Maximum neutral error (@ 0.362283) = 0.538733 deltaE
Average neutral error = 0.345814 deltaE
$ profile -v -A "901HT" -q h -a l -d mt -T p A901HT
No of test patches = 2000
Estimating white point
Approximate White point XYZ = 0.956397 1.003184 1.103095, Lab =
100.122986 -1.882631 -20.131584
Creating optimised per channel curves
About to optimise temporary matrix
..................
About to optimise input curves and matrix
...........................................
About to optimise output curves and matrix
............................................
About to optimise input curves and matrix again
.
About to optimise input, matrix and output together
......................................
About to adjust a and b output curves for white point
Creating fast inverse input lookups
Compensate scattered data for input curves
Compensate scattered data for output curve
Create clut from scattered data
********************************************
Find white & black points
White point XYZ = 0.954914 1.000671 1.099451, Lab =
100.025936 -1.722174 -20.056039
Black point XYZ = 0.004557 0.004770 0.005234, Lab =
4.308683 -0.171197 -2.452371
Fixup clut for white point
Check White point XYZ = 0.954914 1.000671 1.099451, Lab =
100.025938 -1.722174 -20.056039
Done A to B table creation
Creating B to A tables
100%
Done B to A tables
profile check complete, peak err = 3.427144, avg err = 0.645118
Exectution time = 1116.910000 seconds
--
Frédéric
http://www.gbiloba.org
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