[maegul]

Nice work ... really like these!

Personally, I could see myself tweaking the palettes to have a bit more saturation and maybe even have a particular hue palette or have the hues centre around a particular value as you do with the "warm" variant or the "Zenburned" (my fav, and similar to my own manual scheme) in the showcase (https://github.com/mcchrish/zenbones.nvim/blob/main/doc/show...).

Interesting to compare to the the parent post as luminance/brightness contrast based perception is generally better than our colour contrast based perception. There's arguably less information, as colours are categorical (not continuous like brightness) and colours multiplex brightness with hue and saturation, but there are probably some pretty objective metrics in which your kind of scheme would tend to be better in readability.

[solasluaith]

I actually think that in overall perceptual difference, using hue and chroma only is in the same ballpark as luminance only. The relationship between colours would also be totally different as they are arranged on a line vs a circle/polygon in terms of perceptual difference. Would be interesting to compare quantitatively.

Of course that doesn’t tell the whole story because in the end luminance and chroma are not perceived the same way as we tend to associate luminance with more with distance and light and hue and chroma more with the surface properties of the object. (As you mentioned we also tend to treat luminance as a continuous variable and colour as categorical even though both are continuous.) So if you want to use luminance because of this difference, that is a valid, but fundamentally different approach, but I don’t think it would necessarily be superior outright and I’ve tried to make the argument of why I prefer mine.