Handprint : color vision - an extensive online reference about color.

I quibble with infrared radiation being described as "heat,"

http://en.wikipedia.org/wiki/Heat

http://en.wikipedia.org/wiki/Infrared#Heat

but there is some interesting information on the submitted site.

This is an awesome resource, thanks for sharing. I'm going to have to write a bunch of color-related code soon (for image/video processing), so this will be quite handy.

"Extensive" is right, that's quite impressive.