HT> colors tickles our eye's cones in the same way as does a
 HT> specific mixture of pure blue and white light.  This is
 HT> similar to how the human visual system will perceive the
 HT> right mixture of pure red and pure green as being
 HT> equivalent to pure yellow.  The cones that allow us to see
 HT> color cannot identify the actual wavelengths that hit them,
 HT> but if they are stimulated by the right combination of
 HT> wavelengths, then it will appear the same to our eyes as a
 HT> single pure color, or a mixture of a pure color and white
 HT> light.  (Smith, American Journal of Physics, July 2005)

Color perception is more complex than that, c.f. Land Effect,
as in Edwin Land of Polaroid Camera fame.

Paul Rogers, paulgrogers{at}yahoo.com                       -o)
http://www.angelfire.com/or/paulrogers                   /\\
Rogers' Second Law: Everything you do communicates.     _\_V

... This door is baroque; please call Bach later
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