- reversable, but not 1D color transforms in config.ocio
Re: reversable, but not 1D color transforms in config.ocio
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FWIW there is an old pull request for a simple expression transform which would have been perfect for this,
On 3 Feb 2017, at 12:36, Sean Cooper <se...@...
OCIO is just a LUT and simple math processor(+,-,*,**,log, etc.), so its not really intended to implement algorithms like L*a*b*. Some equations are more LUT friendly than others something RGB-like to RGB-like are generally ok, so I'm not sure how well fit CIELab transforms are for LUT quantization (though at first glance it feels like fitting a square peg into a round hole).
As per Troy's suggestion, you can't directly implement CTL in OCIO. So he was saying essentially you could do the mathematically faithful forward and inverse transform on a sample image (like Nuke's CMSTestPattern) and from them you could use Nuke's make LUT functionality, to LUT-ize the Lab calculation and THEN put than in OCIO. But I'd test the resulting LUT pretty well as I'd imagine it fails in a number of spots.
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