HCL: a color model that actually matches our perceptions (2011)
This is a fun topic. Here's a Lab and Lch colour picker I once made: <a href="http://davidjohnstone.net/pages/lch-lab-colour-gradient-picker" rel="nofollow">http://davidjohnstone.net/pages/lch-lab-colour-gradient-pick...</a><p>A keyword not mentioned in this article is "perceptual uniformity". It's the idea that the difference between two colours as measured by the Euclidean difference (of the L, a and b components) will be equal to the perceived difference between colours. That said, it turns out that this isn't quite as true as it was hoped for this colour space, and now there are much more complicated formula for this: <a href="https://en.wikipedia.org/wiki/Color_difference" rel="nofollow">https://en.wikipedia.org/wiki/Color_difference</a>