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