Users’s guide to hues and the magic of sensing an infinite spectrum with only 4 types of light sensors in the human eyeball, and to the difficulties of reproducing that magic for print and RGB display. A case of dimensionality reduction, one of histories more lengthily studied.


Design for non-designers. This is indeed the original what color is the bikeshed problem. Naturally enough, there are too many options.

Color in Inkscape

Colour in imagemagick

Colorspace conversions are hidden in imagemagick.

YTadashi Tokieda