[argyllcms] Argyll-reset and Windows-reset gamma curves
- From: Ivan Kolesov <ivankolesov64@xxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 8 Aug 2013 12:13:02 +0600
Hi,
I've noticed this a while ago, but tested it properly just now:
Whenever Windows loads (without any gamma-altering software starting
automatically), or the gamma curves are reset via 3-party software, the
resulting curves prove to have a small discrepancy with what Argyll seems
to reset to. I've tested this with 'dispwin.exe -V' and specifying an icm
profile without a vcgt tag, and it shows a 0.4% discrepancy. When gamma has
been reset with 'dispwin.exe -c', the discrepancy is 0.0%, just like it
should be.
Right now this can be bypassed by using the -C parameter and some
commandline software, like xcalib, to reset the gamma before each patch to
the 'Windows default'. I've tested it and there might be some difference in
the resulting calibration, or it just might be my imagination.
Well, the main question is how come Argyll's and Windows' default gamma
curves are different? Also, what can be done about it, or should anything
be done? How does this affect the overall calibration and profiling
processes?
Thank you.
Ivan
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