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From: bob@glpsycho.UUCP (Bob Leiser)
Newsgroups: net.physics
Subject: Re: colo(u)rs
Message-ID: <649@glpsycho.UUCP>
Date: Thu, 30-Aug-84 08:34:19 EDT
Article-I.D.: glpsycho.649
Posted: Thu Aug 30 08:34:19 1984
Date-Received: Sun, 26-Aug-84 01:40:37 EDT
Organization: Psychology, Univ. of Glasgow, Scotland
Lines: 12

The 'FULL COLOR image' which appears in Land's demonstration is the product of
visual perception, not of light frequency effects.  The apparent colours are
constructed by the visual system.  If a full colour slide is projected along-
side, the original looks washed-out.  As I remember, the image used is some
real-life scene, where knowledge of what colour trees, sky, people etc. are
aids the active perception process.  One would expect the 'FULL COLOR' effect
to be eliminated if an unfamiliar geometrical pattern were used instead.

Any discussion of how light frequencies appear to the eye is in the domain of
psychology, not physics.

Bob Leiser.