Re: [w3ctag/design-reviews] CSS Color: lab(), lch() (#488)

Okay, here is an example for Lab: the gradient shows sRGB blue (#0000FF) is progressively desaturated by reducing LCH chroma until it meets the neutral axis. Below are shown the (linear-light, not gamma-corrected) R G and B values, it can be seen that R rises faster thus accounting for the purple shift.

https://drafts.csswg.org/css-color-4/images/lab.svg

Here is the same thing in Jzazbz, sRGB blue is progressively reduced in JzCzHz chroma until it gets to the neutral axis. Of note: the green now rises faster, giving a cyan shift. Also the RGB channels do not fully converge on the gray axis, which is very odd.

https://drafts.csswg.org/css-color-4/images/JzczHz.svg

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