[cairo] Adding a color management interface to GTK
spitzak at gmail.com
Thu Jan 21 15:53:24 PST 2010
I think any attempt to do color management is misguided.
We already have a floating-point api for specifying the colors. This
means that the sRGB primaries can support an infinite gamut, as I have
It is true that images used as sources can only contain clamped sRGB
values so they have limited gamut. I think it would be far more
effective to support float and half-float image formats so that an
unclamped value can be in the image.
Any time spent on "color management" that could have been spent
supporting floating point image data is time wasted, imho.
If we are going to support any color space control at all, I want to see
linear sRGB before anything else (this is sRGB primaries but the values
are directly proportional to the amount of energy emitted, rather than a
gamma curve). The conversion from linear sRGB to XYZ and to any other
set of primaries is a 3x3 matrix multiplication and can be done at
blinding speed by graphics cards. Non-linear such as sRGB are somewhat
slower but not impossible.
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