- From: Isaac Muse via GitHub <sysbot+gh@w3.org>
- Date: Wed, 29 Sep 2021 13:31:06 +0000
- To: public-css-archive@w3.org
So, I am curious. It seems there is talk about using chroma reduction using Oklch for gamut mapping/reduction. I was playing around with this and was noticing some interesting things when gamut mapping using this method. Granted, maybe I'm doing something wrong here. This is based on the same algorithm used in color.js for Lch chroma and using the currently specified ∆Eok in that library. When using something like display-p3, things get mapped very similar as they do with Lch vs Oklch, granted I think their blue range is very similar. But when using something like rec2020 which has a wider blue range, the mapping gets dull blues. (oklch chroma reduction on top). <img width="1208" alt="Screen Shot 2021-09-29 at 7 16 57 AM" src="https://user-images.githubusercontent.com/1055125/135276330-06eeeb21-95cf-4f50-858c-d75c9fd89972.png"> This doesn't happen as much with greens and lesser with reds. Now granted there doesn't seem to be an official algorithm posted yet, and so I'm more curious if all these edge cases have been evaluated. Maybe the actual algorithm that is to be used compensates for this. I'm more curious if it improves in some places, but lesser in others, or if there is a better algorithm (different from the CIELCH one used on colorjs.io) that is planned to be used that works well with Oklch? It's possible I'm just not implementing correctly, and in that case, I will wait patiently to better understand how the reduction is actually done, or keep plugging away to see what I'm doing wrong 🙂. -- GitHub Notification of comment by facelessuser Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/6642#issuecomment-930178462 using your GitHub account -- Sent via github-notify-ml as configured in https://github.com/w3c/github-notify-ml-config
Received on Wednesday, 29 September 2021 13:31:08 UTC