[argyllcms] Display calibration

  • From: Frédéric Mantegazza <frederic.mantegazza@xxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Sat, 1 Dec 2007 11:18:23 +0100

Hello,

I received the i1 Display 2 colorimeter for the photoclub, and made a first 
profile. Results are strange... First, when I load the profil in iccexamin 
and lprof, they both say that White Point is near 12000K! But during 
measurements, argyll said 6700K.

Second, it seems that red color is over-saturated...

Here are the commands I used :

$ targen -v -d3 -f200 A901HT
$ dispcal -v -y c -d2,1 -m 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 = native white point
Target brightness = native brightness
Target gamma = 2.200000

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 desired white point. Press space when done.
  Initial B 110.80, x 0.1985, y 0.3899, VDT 6762K DE 30.2
/ Current B 110.72, x 0.1984, y 0.3907  VDT 6753K DE 30.2  R+  G-- B+

Adjust CRT Contrast or LCD Brightness to desired level. Press space when 
done.
  Initial 110.72
/ Current 80.77

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 0.81, x 0.1978, y 0.3919
/ Current B 0.86, x 0.1812, y 0.4670  DE 24.4  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   0.05   0.11   0.12
Red   = XYZ  16.38  16.37   1.88
Green = XYZ  12.68  58.07  10.56
Blue  = XYZ  11.90   6.92  72.16
White = XYZ  40.74  80.85  84.70
patch 64 of 64
Initial native brightness target = 80.845374 cd/m^2
Had to scale brightness from 80.845374 to 80.818901 to fit within gamut
Target white value is XYZ 40.724326 80.818901 84.670188
Adjusted target black XYZ 0.05 0.11 0.11, Lab 1.20 0.00 0.00
Target black after min adjust: XYZ 0.05 0.11 0.11, Lab 1.22 0.00 -0.00
Current gamma curve offset = 0.065136, Gamma curve power = 2.420341
Total Iteration 3, Final Samples = 64 Final Repeat threshold = 0.800000
Creating initial calibration curves...
Doing iteration 1 with 16 sample points and repeat threshold of 3.200000 DE
patch 16 of 16
Brightness error = 0.000000 cd/m^2
White point error = 0.000000 deltaE
Maximum neutral error (@ 0.277258) = 2.569797 deltaE
Average neutral error = 1.061537 deltaE
Computing update to calibration curves...
Doing iteration 2 with 32 sample points and repeat threshold of 1.600000 DE
patch 32 of 32
Brightness error = 0.000000 cd/m^2
White point error = 0.000000 deltaE
Maximum neutral error (@ 1.000000) = 1.000000 deltaE
Average neutral error = 0.527490 deltaE
Computing update to calibration curves...
Doing iteration 3 with 64 sample points and repeat threshold of 0.800000 DE
patch 64 of 64
Brightness error = 0.000000 cd/m^2
White point error = 0.000000 deltaE
Maximum neutral error (@ 1.000000) = 1.000000 deltaE
Average neutral error = 0.450462 deltaE
Computing update to calibration curves...
The instrument can be removed from the screen.

$ dispread -v -y c -d 2,1 -k A901HT.cal A901HT
$ profile -v -A "901HT" -q m -a s A901HT

I attached the ICC profile...

-- 
   Frédéric

   http://www.gbiloba.org

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