This has been discussed on Krita Artists a few times and so I wanted to make a bug to track it as I couldn't find an existing bug for it. Please let me know if there is a better place or way to track this feature request. OKLAB and OKLCH make for more dynamic and less grey results when mixing digital paints and make selecting colors at the same perceptual lightness and chroma much easier from color pickers. They are also supported by the W3 CSS standard, Godot (and many other game engines), G'MIC, as well other paint and image editors. There have been some efforts to modify Krita's source code, add icc files, and make plugins which support OKLAB colors but an official form of these changes I think would be beneficial. IMPLEMENTATIONS - https://krita-artists.org/t/oklab-support/75285 - https://krita-artists.org/t/add-oklab-color-space-i-experimented-with-some-things/32285 ADDITIONAL INFORMATION - https://bottosson.github.io/posts/oklab/ - https://raphlinus.github.io/color/2021/01/18/oklab-critique.html - https://en.wikipedia.org/wiki/Oklab_color_space - https://krita-artists.org/t/the-best-color-selector/31990 - https://krita-artists.org/t/half-tone-selector-plugin-for-painting/88377/21 - https://krita-artists.org/t/hcl-sliders/88250
So, LittleCMS does have preliminary support for this space as a type of LAB profile, however, the profile cannot be saved, so we'd need to setup some things to ensure that there's a good workflow, like separate way of storing in kra files, ways to convert properly, etc.