Re: fundamental question - monitor profile as working RGB
Re: fundamental question - monitor profile as working RGB
- Subject: Re: fundamental question - monitor profile as working RGB
- From: John Hee Soo Lee <email@hidden>
- Date: Wed, 10 Dec 2003 01:35:52 -0800
Keeping the linear video LUT with native CRT gray balancing is great
but it has fundamental flaws. Although CRT seems to have smooth
gradients but it's not a perfect gamma function; as in many working
space profiles.
Later when an image mastered on your monitor need to be properly
displayed on another traditionally color managed system, you will need
to be able to provide your working space icc profile with LUT that
describes the monitor gamma (response curve).
If you want to be compatible in the color managed world with linear
video LUT, here is the step that need to happen to create a a proper
working space profile for linear video LUT calibration with desired
white point.
1. Gray balance the monitor with linear video LUT
2. Measure your monitor RGB primaries.
3. Measure the 255 gray patches (0,0,0),(1,1,1)...(255,255,255) or
subset that is most important.
4. Build a working space profile with the all the data sets: white
point, RGB primaries, and RGB 10bit LUT that describe response curve of
your monitor.
I'm also assuming that gray patches are perfectly gray balanced. I'm
also not counting in for the black and white luminance level set on
your monitor. That information need to be pass to the viewer of your
image. So that they can gray balance their monitor with the exact
levels on your monitor.
Certainly this touches many other topics in color management in general.
From my knowledge there are no commercial solution to do this at the
moment.
--
john hee soo lee @ pixar animation studios
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