[argyllcms] "Failed to meet target 0.4, got worst case 0.3" WTF?

  • From: Niccolò Belli <darkbasic4@xxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Thu, 11 Nov 2010 22:15:26 +0100

Argyll 1.3.2, Gentoo Linux amd64

# dispcal -v -yl -t -g2.2 -F -H -V -Ibw -qh calibrazione
Setting up the instrument
Instrument Type:   ColorMunki
Serial Number:     xxxxxxx
Firmware version:  288
Chip ID:           xx-xxxxxxxxxxxxxx
Version string:    'colormunki FW V1.32  Build Nr. 1303'
Calibration Ver.:  6
Production No.:    xxxxx
Set instrument sensor to calibration position,
 and then hit any key to continue,
 or hit Esc or Q to abort:
Calibration complete

Place instrument on test window.
Hit Esc or Q to give up, any other key to continue:
Display type is LCD
Target white = native white point
Target white brightness = native brightness
Target black brightness = native brightness
Target advertised gamma = 2.200000

Display adjustment menu:
Press 1 .. 7
1) Black level (CRT: Offset/Brightness)
2) White point (Color temperature, R,G,B, Gain/Contrast)
3) White level (CRT: Gain/Contrast, LCD: Brightness/Backlight)
4) Black point (R,G,B, Offset/Brightness)
5) Check all
6) Measure and set ambient for viewing condition adjustment
7) Continue on to calibration
8) Exit
Commencing device calibration
patch 6 of 6

Black = XYZ   3.18   3.30   6.24
Red   = XYZ 126.02  72.37  23.69
Green = XYZ 124.67 215.09  46.57
Blue  = XYZ  77.37  65.91 362.80
White = XYZ 321.86 346.94 419.89
patch 80 of 80
Initial native brightness target = 346.935940 cd/m^2
Target white value is XYZ 321.862361 346.935940 419.890332
Adjusted target black XYZ 3.19 3.30 6.26, Lab 8.58 1.41 -6.83
Target black after min adjust: XYZ 3.187 3.302 6.256, Lab 8.582 1.410 -6.829
Gamma curve input offset = 0.000000, output offset = 0.009517, power =
2.250712
Total Iteration 4, Final Samples = 96 Final Repeat threshold = 0.400000
Creating initial calibration curves...
Doing iteration 1 with 12 sample points and repeat threshold of 1.131371 DE
patch 12 of 12
Brightness error = 0.000000 cd/m^2 (is 346.727651, should be 346.727651)
White point error = 0.000000 deltaE
Maximum neutral error (@ 0.065376) = 1.059393 deltaE
Average neutral error = 0.493535 deltaE
Number of measurements taken = 21
Computing update to calibration curves...
Doing iteration 2 with 24 sample points and repeat threshold of 0.800000 DE
patch 24 of 24
Brightness error = 0.000000 cd/m^2 (is 346.698659, should be 346.698659)
White point error = 0.000000 deltaE
Maximum neutral error (@ 0.451898) = 0.793305 deltaE
Average neutral error = 0.444618 deltaE
Number of measurements taken = 32
Computing update to calibration curves...
Doing iteration 3 with 48 sample points and repeat threshold of 0.565685 DE
patch 48 of 48
Brightness error = 0.000000 cd/m^2 (is 346.671245, should be 346.671245)
White point error = 0.000000 deltaE
Maximum neutral error (@ 0.019406) = 0.561966 deltaE
Average neutral error = 0.298051 deltaE
Number of measurements taken = 81
Computing update to calibration curves...
Doing iteration 4 with 96 sample points and repeat threshold of 0.400000 DE
patch 96 of 96
Brightness error = 0.000000 cd/m^2 (is 346.606991, should be 346.606991)
White point error = 0.000000 deltaE
Maximum neutral error (@ 0.193201) = 0.703763 deltaE
Average neutral error = 0.327364 deltaE
Failed to meet target 0.400000 delta E, got worst case 0.362716
Number of measurements taken = 411
The instrument can be removed from the screen.
Written calibration file 'calibrazione.cal'

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