HSP color model

[leeoniya]

here's something may be worth adding that piggybacks on the H and S of HSL, but changes the L (luminance) to P perceived brightness. The turns out to be quite a visually intuitive way to adjust color brightness.

http://alienryderflex.com/hsp.html

[roryokane]

The HSP color model seems less useful than the similar HSL_uv (HSLuv) model. Both models define Saturation as a percentage of maximum chroma, and have a perceptual Lightness. But HSL_uv fixes the Hue too, so that the hues are spread perceptually uniformly. See the table of comparison between HSL and HSL_uv.

Since HSL_uv seems strictly better than HSP, for all uses except reading values that people have already defined in HSP, I don’t think HSP should be supported.

HSL_uv already has a standalone JavaScript library, but you could still support it in chroma.js if you wanted.