[argyllcms] Dispread white drift compensation problem

  • From: Vallo Kallaste <kalts@xxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Thu, 18 Dec 2014 13:24:11 +0200

Hi

Sorry if that shows up twice. It has been several hours since posting and still 
nothing.

I recently aquired i1D3 colorimeter and am testing or "getting to know" it.
I noticed that colprof profile check results have very large difference
depending on the usage of dispread white compensation, -Iw.
Test data (.ti1 file) is same, the difference comes only from -Iw usage.
Monitor is in native, uncalibrated state and warmed up. Linked are two tone
response graphs from dispcalGUI, I did not use it for else.

Dispread command:
dispread -yl -v2 -c1 -Iw -X monitor.ccss native

colprof -v -qh -al (dispread with -Iw):
Profile check complete, peak err = 105.085290, avg err = 4.181563, RMS = 
7.683822

colprof -v -qh -al (dispread without -Iw):
Profile check complete, peak err = 4.465727, avg err = 0.536961, RMS = 0.668549

http://bsd.ee/~kalts/Tone_response_curves_without_Iw.png
http://bsd.ee/~kalts/Tone_response_curves_with_Iw.png
-- 
Vallo

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