[argyllcms] Monitor calibration
- From: nome cognome <darkbasic4@xxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Wed, 22 Jul 2009 22:35:21 +0200
Hi,
I have a Nec MultiSync 3090WQXi which has a 12bit LUT and an X-Ryte
Eye-One Display 2. Unfortunately I cannot use basICColor for hardware
calibration because the "hardware calibration" option is grayed out,
but I can use a software called Spectraview II to perform it.
This is how I configured Spectraview II, with the exception of the
intensity level (which is 140cd/m^2 instead of 120) and the
calibration priority which is "maximise contrast ratio" instead of
"best grayscale color tracking":
http://darkbasic.homelinux.com/images/sv2/sv2_1.jpg
http://darkbasic.homelinux.com/images/sv2/sv2_2.jpg
http://darkbasic.homelinux.com/images/sv2/sv2_3.jpg
http://darkbasic.homelinux.com/images/sv2/sv2_4.jpg
http://darkbasic.homelinux.com/images/sv2/sv2_5.jpg
http://darkbasic.homelinux.com/images/sv2/sv2_6.jpg
http://darkbasic.homelinux.com/images/sv2/sv2_7.jpg
Spewctraview II is not a masterpiece, in fact if I run "dispcal -v -yl
-t6500 -g2.2 -qu calibrazione" (after the hardware calibration
performed with spectraview II) and I choose "2) White point (Color
temperature, R,G,B, Gain/Contrast)" I get DE 2.7 which is not so good
(I'm sure that Spectraview II performs hardware calibration, I used
X-Ryte Calibration (LUT) Tester to see if the video card LUT was
linear).
Target Br 133.11, x 0.3128, y 0.3291
Current Br 133.09, x 0.3074, y 0.3246 DE 2.7 R++ G+ B-
So I decided to perform also a software calibration (my video card is
an Ati Radeon HD 3870 which has a 10bit LUT). I typed "dispcal -v -yl
-t6500 -g2.2 -qu calibrazione" again and I pressed 7 to continue on to
calibration.
I did a little test to see if if I have obtained benefits by adding
Argyll software calibration:
1) Only hardware calibration + Argyll profiling
targen -v -d3 -f200 -A.5 -c"LCD3090WQXi 88100898YB.icc" monitor_140_m_1
LCD3090WQXi 88100898YB.icc is the profile created with Spectraview II.
dispwin -c
dispread -v -yl monitor_140_1
colprof -v -qm -ni -no -np -as monitor_140_1
targen -v -w -d3 -e 1 -g 32 -f 320 -r check_monitor_140_1
I created a new test chart to avoid the use of the same patches used
for profiling.
dispread -v -yl check_monitor_140_1
profcheck -v -k -w check_monitor_140_1.ti3 monitor_140_1.icm >
profcheck_monitor_140_1.log
Profile check complete, errors(CIEDE2000): max. = 1.926604, avg. =
0.308265, RMS = 0.380178
With only the hardware calibration (which has DE 2.7) the average error is 0.3.
2) Hardware calibration + Argyll software calibration + Argyll profiling
dispcal -v -yl -t6500 -g2.2 -qu calibrazione
targen -v -d3 -f200 -A.5 -c"LCD3090WQXi 88100898YB.icc" monitor_140_2
dispread -v -yl -kcalibrazione_140.cal monitor_140_2
colprof -v -D"monitor_140_2" -qm -ni -no -np -as monitor_140_2
targen -v -w -d3 -e 1 -g 32 -f 320 -r check_monitor_140_2
dispread -v -yl -kcalibrazione_140.cal check_monitor_140_2
profcheck -v -k -w check_monitor_140_2.ti3 monitor_140_2.icm >
profcheck_monitor_140_2.log
Profile check complete, errors(CIEDE2000): max. = 1.972252, avg. =
0.802361, RMS = 0.838653
With hardware calibration (which has DE 2.7) + Argyll software
calibration (Ultra quality) the average error is 0.8!
Is this what should I expect? DE 2.7 is not a good result, so I
thought that I would have gained color accuracy calibrating with
Argyll before profiling.
Darkbasic
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