Is there a public specification somewhere? The only thing I could find is the code in the "material-color-utilities" on github.
Looking at the code, it seems the computations are much more involved than OkLab, especially in the HCT -> RGB direction?
Looking at the code, it seems the computations are much more involved than OkLab, especially in the HCT -> RGB direction?
#1 it takes the most modern widely accepted space in color science, CAM16 for hue and colorfulness. CAM16 is relatively incredibly complex, about 500 lines of code. #2 it maps it to L*.
#1 is because nobody gets fired for basing Google's color system on CAM16. #2 is for WCAG.
There was continually interesting conversations on what exactly the name of the space was and whether it represented a new color space that precluded more formalization of it, the code ended up being the spec as it were. I did get a blog post out: https://material.io/blog/science-of-color-design