The Living Thing / Notebooks :

Colour

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.

Practicalities

color in Inkscape

colour in imagemagick

colorspace conversions are a little bit hidden in imagemagick.