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2007.10.23 21:02 "Re: Floating-point 32bit sample data", by Kai-uwe Behrmann
Am 23.10.07, 19:21 +0200 schrieb Joris: > Kai-Uwe Behrmann wrote: > > > Are floating point RGB data stored gamma corrected or linearized? > > > > The data is best stored in a linear matrix space, much like camera > > RAW. OpenEXR even suggests now to use XYZ instead of RGB. > > Only, there isn't a photometric value for it. > > RGB, without embedded ICC profile, is mostly agreed upon to mean sRGB. Another > and probably more unambigious way to store color data, even if I feel RGB is > regarded sRGB by just about anyone, is CIE L*a*b*, and there's a proper > photometric for that one and a totally unambigious scale and meaning for > floating point CIE L*a*b* data. How would you handle the different gammas in CIE*Lab for typical floating point HDR content? Of course you are right to point out, that a ICC profile is needed to give a meaning to the image colours. kind regards Kai-Uwe Behrmann -- developing for colour management www.behrmann.name + www.oyranos.org + www.cinepaint.org