> at the boundary of what can be done algorithmically with satisfactory results Mostly due to insufficient models of human perception of color. Our perception

> at the boundary of what can be done algorithmically with satisfactory results Mostly due to insufficient models of human perception of color. Our perception of color is not accurate, so picking complementary colors based on their actual wavelength will be less pleasing than picking complementary colors based on a perceptual model. I don't think any of the pickers you link to attempt this. One attempt with libraries in a few common languages is HUSL: http://www.boronine.com/husl/syntax/#997061 http://www.boronine.com/husl/syntax/#997061 A much older approach is described here: http://en.wikipedia.org/wiki/CIELUV http://en.wikipedia.org/wiki/CIELUV Learn more about color perception here: http://en.wikipedia.org/wiki/Color_perception http://en.wikipedia.org/wiki/Color_perception [Edit: just noticed this was referenced by this comment below: https://news.ycombinator.com/item?id=7562905 https://news.ycombinator.com/item?id=7562905]