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From: julian@riacs.edu (Julian E Gomez)
Newsgroups: sci.electronics,comp.graphics
Subject: Re: Perceptual Color (was: Re: Looking for Blue LEDs)
Message-ID: <987@hydra.riacs.edu>
Date: 11 Oct 88 23:02:21 GMT
References: <1138@nmtsun.nmt.edu> <862@ritcv.UUCP> <255@rna.UUCP> <4422@lynx.UUCP> <175@leibniz.UUCP>
Organization: RIACS, NASA Ames Research Center
Lines: 16

In article <175@leibniz.UUCP>, hwt@leibniz.UUCP (Henry Troup) writes:
> I remember, long years ago (over 20, awright), seeing 'colour' on a B&W
> TV.  One of the standard optical illusions is a black and white rotating
> disk that shows visual brown and green.  Fascinatingly enough, this came
> over very well on a British (25-frame? 400 line (the old British system)) TV.

What you saw is known as a Fechner wheel.

Bay Area SIGGRAPH had a meeting on color recently; this was one of the
items discussed.  Email me if you want more info.

-- 
"Have you ever wondered if taxation without representation was cheaper?"

	Julian "a tribble took it" Gomez
	julian@riacs.edu