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From: msw1633@zeus.tamu.edu (WHITSITT, MARK STEVEN)
Newsgroups: sci.bio
Subject: Re: Primary colors in human color vision
Message-ID: <13659@helios.TAMU.EDU>
Date: 23 Mar 91 07:57:14 GMT
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In article <00945FE5.1F9B5480@aclcb.purdue.edu>, miguel@aclcb.purdue.edu (Phillip) writes...
> 
>   The additive primary hues, according to an undergrad general psychology 
>text book I have (Gleitmann (sp?)), are blue and yellow (which are 
>complementary) and red and green (complementary)....
>    The subtractive primaries are different.  Two pigments mixed together 
>only allow wavelengths neither absorbs to be reflected.  
>    So how does a color TV work?  I understand that it uses only red green 
>and blue and that red and green mixed together (and surely this would be an 
>additive process, not a subtractive one) produce yellow.
>    Does anyone know?
>                                    _            _
>__________________________  _      (_)  ________(_)________________________
>Phillip SanMiguel        _/  \     /  \  Purdue University Juggling Club


As I understand it, the primary pigments (subtractive primaries), the primary 
hues of vision, and the primary colors of light are all different.  The hues of 
vision are subject to stimulation of the rods and cones in the eye and then the 
brain perceives these as the various colors.  Other than that, the pigments 
interact differently than the colors of light do to produce the various colors.  
It is all very involved and maybe someone can give a fuller explanation than 
this.



Mark S. Whitsitt, N5RJF        Texas A&M University, Dept of Biochemistry
Bitnet:  MSW1633@TAMSIGMA  		  College Station, Tx. 77843-2128
Internet:  MSW1633@SIGMA.TAMU.EDU 			   (409) 845-0832
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