Hey, I think you guys are misunderstanding. Mr. (or is it Mrs.?) luppy ALREADY knows about RGB color mixing, but he/she wants to know more about RYB. This is completely different, as mixing all the colors together gives you BLACK instead of WHITE. I found a website with vast information on this issue, and it is far beyond the scope of what I wish to study.
http://www.handprint.com/HP/WCL/color6.html#theoryadd It's more theory than just simple calculations, it looks like. But obviously it can be translated into formulas, as it has been done.
[ April 02, 2007: Message edited by: Eric Daly ]