[argyllcms] Difficult in calibration

Today I have try to calibrate my old Imac with Dispcal. Below the 
results: the average and maximum error at the end are worse than at 
beginning. Why?

Thank you
Marco

>>


Last login: Wed Nov 4 10:50:39 
on ttys000
iMac-di-Marco-Noldin:~ Marco$ /Applications/Argyll/Argyll_V1.
0.4/bin/dispcal -v -yl -t 6500 -g2.2 -k0 -qh calibr_Imac_04_11_09

Setting up the instrument
Instrument Type: Eye-One Pro
Serial Number: 
120288
Firmware version: 302
CPLD version: 301
Date manufactured: 12-4-
2005
U.V. filter ?: No
Measure Ambient ?: Yes
Tot. Measurement Count: 
33833
Remission Spot Count: 7330
Remission Scan Count: 358
Date of last 
Remission spot cal: Thu Sep 17 15:48:50 2009
Remission Spot Count at 
last cal: 7328
Total lamp usage: 12059.380859
Place cap on the 
instrument, or place in on a dark surface,
or place on the white 
calibration reference,
and then hit any key to continue,
or hit Esc, ^C 
or Q to abort:
Calibration complete

Place instrument on test window.

Hit Esc, ^C or Q to give up, any other key to continue:
Display type is 
LCD
Target white = 6500.000000 degrees kelvin Daylight spectrum
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
Doing some 
initial measurements
White = XYZ 144.97 150.28 162.68

Adjust CRT 
Contrast or LCD Brightness to desired level. Press space when done.

Initial 150.28

Sample read failed due to misread
Hit Esc, ^C or Q to 
give up, any other key to retry:
/ Current 137.28
Sample read failed 
due to misread
Hit Esc, ^C or Q to give up, any other key to retry:
/ 
Current 113.95
Sample read failed due to misread
Hit Esc, ^C or Q to 
give up, any other key to retry:
\ Current 124.44
Sample read failed 
due to misread
Hit Esc, ^C or Q to give up, any other key to retry:
\ 
Current 124.34
Sample read failed due to misread
Hit Esc, ^C or Q to 
give up, any other key to retry:
\ Current 329.39
Sample read failed 
due to misread
Hit Esc, ^C or Q to give up, any other key to retry:
/ 
Current 136.45
Sample read failed due to misread
Hit Esc, ^C or Q to 
give up, any other key to retry:
\ Current 116.29 ^[
Sample read 
stopped at user request!
Hit Esc, ^C or Q to give up, any other key to 
retry:
The instrument can be removed from the screen.
dispcal: Error - 
display read failed with 'User Aborted'

iMac-di-Marco-Noldin:~ Marco$

iMac-di-Marco-Noldin:~ Marco$ /Applications/Argyll/Argyll_V1.0.4
/bin/dispcal -v -yl -t 6500 -g2.2 -k0 -qh calibr_Imac_04_11_09
Setting 
up the instrument
Instrument Type: Eye-One Pro
Serial Number: 120288

Firmware version: 302
CPLD version: 301
Date manufactured: 12-4-2005
U.
V. filter ?: No
Measure Ambient ?: Yes
Tot. Measurement Count: 33833

Remission Spot Count: 7330
Remission Scan Count: 358
Date of last 
Remission spot cal: Thu Sep 17 15:48:50 2009
Remission Spot Count at 
last cal: 7328
Total lamp usage: 12059.380859
Place cap on the 
instrument, or place in on a dark surface,
or place on the white 
calibration reference,
and then hit any key to continue,
or hit Esc, ^C 
or Q to abort:

Calibrate failed with 'User hit Abort Key' (No device 
error)
The instrument can be removed from the screen.
dispcal: Error - 
new_disprd() failed with 'Instrument Access Failed'

iMac-di-Marco-
Noldin:~ Marco$ /Applications/Argyll/Argyll_V1.0.4/bin/dispcal -v -yl -
t 6500 -g2.2 -k0 -N -qh calibr_Imac_04_11_09
Setting up the instrument

Instrument Type: Eye-One Pro
Serial Number: 120288
Firmware version: 
302
CPLD version: 301
Date manufactured: 12-4-2005
U.V. filter ?: No

Measure Ambient ?: Yes
Tot. Measurement Count: 33833
Remission Spot 
Count: 7330
Remission Scan Count: 358
Date of last Remission spot cal: 
Thu Sep 17 15:48:50 2009
Remission Spot Count at last cal: 7328
Total 
lamp usage: 12059.380859
Place instrument on test window.
Hit Esc, ^C 
or Q to give up, any other key to continue:
Display type is LCD
Target 
white = 6500.000000 degrees kelvin Daylight spectrum
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

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 0.16 0.14 0.21
Red = XYZ 49.79 25.44 1.48

Green = XYZ 36.39 73.36 11.27
Blue = XYZ 19.26 10.25 106.10
White = XYZ 
105.04 108.70 118.41
patch 80 of 80
Initial native brightness target = 
108.702267 cd/m^2
Had to scale brightness from 108.702267 to 106.973663 
to fit within gamut,
corresponding to RGB 0.960370 1.000000 0.990181

Target white value is XYZ 101.676149 106.973663 116.429263
Adjusted 
target black XYZ 0.15 0.13 0.21, Lab 1.06 1.27 -0.93
Target black after 
min adjust: XYZ 0.15 0.13 0.21, Lab 1.06 1.27 -0.93
Gamma curve input 
offset = 0.060350, output offset = 0.000000, power = 2.403165
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 = -2.011951 cd/m^2
White point error = 1.140853 deltaE
Maximum 
neutral error (@ 1.000000) = 1.349361 deltaE
Average neutral error = 
0.822225 deltaE
Failed to meet target 1.131371 delta E, got worst case 
1.349361
Number of measurements taken = 50
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 = 
-1.976754 cd/m^2
White point error = 1.236497 deltaE
Maximum neutral 
error (@ 0.000000) = 1.998608 deltaE
Average neutral error = 0.622495 
deltaE
Failed to meet target 0.800000 delta E, got worst case 1.998608

Number of measurements taken = 96
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 = -2.521551 cd/m^2
White 
point error = 1.103906 deltaE
Maximum neutral error (@ 0.000000) = 
3.853965 deltaE
Average neutral error = 0.762469 deltaE
Failed to meet 
target 0.565685 delta E, got worst case 3.853965
Number of measurements 
taken = 239
Computing update to calibration curves...
Doing iteration 4 
with 96 sample points and repeat threshold of 0.400000 DE
patch 33 of 
96
Sample read failed due to misread
Hit Esc, ^C or Q to give up, any 
other key to retry:
patch 96 of 96
Brightness error = -2.458040 cd/m^2

White point error = 1.523172 deltaE
Maximum neutral error (@ 0.000000) 
= 6.771865 deltaE
Average neutral error = 1.401901 deltaE
Failed to 
meet target 0.400000 delta E, got worst case 4.855975
Number of 
measurements taken = 783
The instrument can be removed from the screen.

Written calibration file 'calibr_Imac_04_11_09.cal'
iMac-di-Marco-
Noldin:~ Marco$



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