Notice of Meeting - Output Transforms Architecture VWG - March 2, 2022

Discussions - ACESNext VWG – Output Transforms
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Output Transforms Architecture VWG Meeting

Wednesday, March 2, 2022
1pm Pacific time Add to Calendar (.ics)

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The recording and notes from meeting #43 are now available.

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Interesting meeting ! If anyone was looking for it, here is the link to Nick´s Gamut Compressor variation (back in July 2020).

Chris

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I’ll use this term
Chromaticity-Linear : traveling along a linear line in CIE xy cartesian chromaticity space between some source chromaticity and the achromatic axis of the current RGB colorspace. Does not necessarily imply luminance-preserving.

Looking back at those ancient posts is a good refresher on how much I’ve learned over the last couple years. Jeeze.

A few bits of information which maybe someone will find useful.

The so-called “hexagonal” gamut compression method is just a saturation adjustment: a lerp towards achromatic by some factor. It uses (can use) max(r,g,b) as the norm, and the factor is (can be) a compression of chroma. This results in a chromaticity-linear chromaticity adjustment. The norm could also be luminance or mean of rgb or something else if desired.

More details in the implementations below.
GamutCompress_ChromaticityLinear.nk (1.1 KB)
GamutCompress_ChromaticityLinear.dctl (853 Bytes)

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