As I read it, for "physical correctness" gamma is the most important consideration. When selecting your initial color palette, though, it is true hue and satur

As I read it, for "physical correctness" gamma is the most important consideration. When selecting your initial color palette, though, it is true hue and saturation do have nonlinear perception. There are (somewhat complicated) color spaces designed to deal with that: https://en.wikipedia.org/wiki/Lab_color_space https://en.wikipedia.org/wiki/Lab_color_space http://www.husl-colors.org/ http://www.husl-colors.org/ lets you play with a compromise color space.