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From: jk3k+@andrew.cmu.edu.UUCP
Newsgroups: sci.misc
Subject: Re: Color
Message-ID: <8VicPfy00Xo3QHM08t@andrew.cmu.edu>
Date: Mon, 7-Dec-87 05:46:03 EST
Article-I.D.: andrew.8VicPfy00Xo3QHM08t
Posted: Mon Dec  7 05:46:03 1987
Date-Received: Sat, 12-Dec-87 09:28:46 EST
Organization: Carnegie Mellon University
Lines: 10
In-Reply-To: <3290002@hpindda.HP.COM>

Some more information about color perception:  When you add two colors of 
light, you get something that looks in-between but less pure.  So if i show 
you a mixture of yellow and blue light, it will indeed look green.  Then if 
show you monochromatic green light, it will look more green.  Thus with any 
finite set of colors, you can't generate all the others, although you can get 
pretty close.  The exception to this is purple, which, as pointed out before, 
is really only a mixture of red and violet.  So if you mix together red and 
violet lights, you get something which is _really_ purple.

--Joe