This color space is plotted on something called the CIE chromaticity diagram, with which you are probably familiar.http://en.wikipedia.org/wiki/ChromaticityThis picture may not link, you may have to click on it...There are a number of different ways to mathematically translate that human visual space, CIE L*A*B, CIExyz, etc. but they all can be converted from one to another with no loss of informat