CSSWG is discussing channel clipping in Oklch and other spaces

[Athari]

CSSWG is currently discussing fixing the issues with clipping of out-of-gamut colors:

• [css-color-4] Channel clipping breaks author expectations, especially when using 'perceptually uniform' spaces w3c/csswg-drafts#9449

Naive clipping leads to nonuniform lightness, so the plan is to implement more sophisticated clipping. The final algorithm isn't set in stone yet (Chrome devs aren't responding), but I think it's important to follow the issue and maybe implement the current proposal.

[waacton]

Thanks for the link, I'll keep it in mind. I hope there will be a summary because I don't have the energy to wade through hundreds of comments of debate at the moment!

If it's just about using the existing CSS gamut mapping but to Rec. 2020 instead of sRGB, that's almost certainly possible in Unicolour currently with a little bit of config wrangling.

I hope it doesn't end up with a change to the chroma reduction algorithm itself, there were some edge cases that were painful to track down and handle...