Support Oklab Color Space

Oklab is a perceptual color space for image processing

A perceptual color space is desirable when doing many kinds of image processing. It is useful for things like:

Turning an image grayscale, while keeping the perceived lightness the same

Increasing the saturation of colors, while maintaining perceived hue and lightness

Creating smooth and uniform looking transitions between colors

Working in Oklab is so intuitive and artist friendly. One quickly realised how hobbled they were working in RGB. It would be a game changer if we could use this natively within Blender.

Funnily enough, this presentation, produced within Minecraft, is a great demonstration of why Oklab is worthy of Blender's attention.