Re: ICC applying in macOS 10.12
Re: ICC applying in macOS 10.12
- Subject: Re: ICC applying in macOS 10.12
- From: Vitaly Bondar <email@hidden>
- Date: Wed, 26 Jul 2017 16:18:13 +0300
Hello,
I do not know why you think that Mac OS does not correctly use the
calibration when the profile is used.
Sorry, for unclean explanation.
I will try in more details.
Lets assume i want to have calibration to sRGB and to have accurate
display profile.
I do next steps:
1. apply "generic rgb profile" to display
2. make calibration to sRGB
3. apply copy of generic profile + vcgt
4. measure everything and calculate icc v4 profile
5. apply icc v4 profile + vcgt
After point 3 i have calibrated display, but not accurate profile. After
this point the profile does not describe display, but just a copy of
Generic RGB profile.
After point 5 my display is not sRGB anymore. It is gamma 1.8, the same
as in Generic RGB profile
This happens because XYZ->RGB transformation from my profile is now used
before graphics-board will apply LUTs from vcgt.
I will appreciate much if somebody will explain what is wrong in my
sequence and understanding of ColorSync approach.
Thank you.
Best regards,
Vitaly Bondar
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