On Tue, 2 Mar 2010 07:24:05 -0800 (PST), Art Unwin
wrote:

Were you aware that Maxwell gave a lecture to the Royal Society in
England on this very subject of primary colours?

Yep. See:
http://www.greatreality.com/color/ColorMaxwell.htm
He created the first color photograph using his idea of 3 primary
colors (red, blue, yellow) but without sensitivity to red or green.
Maxwell left a few unanswered questions about his method of color
photogrpahy:
http://www.greatreality.com/color/ColorDidMKnow.htm
Maxwell had a good start, but not the whole answer:
http://www.greatreality.com/ColorPrimary.htm

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