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From: walsh@ihuxi.UUCP
Newsgroups: net.followup
Subject: Re: Are you seeing pink walls?
Message-ID: <732@ihuxi.UUCP>
Date: Mon, 12-Dec-83 16:56:52 EST
Article-I.D.: ihuxi.732
Posted: Mon Dec 12 16:56:52 1983
Date-Received: Tue, 13-Dec-83 06:38:42 EST
References: <153@cal-unix>
Organization: AT&T Bell Labs, Naperville, Il
Lines: 14

Your eyes will always 'see' the complimentary color of anything you've
been looking at for a while, when you look at a white or pale surface.
Such as when you stare at a blue (bright) image for a few seconds, and then
look at the white cieling, you'll see an orange 'shadow' that is the same
shape as the blue image. Green and red are complimentary, and the image is
pink because of the brightness and light value of the green on terminal
screens. I have a green on black screen, and I'm always seeing pink! I don't
know the exact medical reasons for this reverse imaging; maybe the cones
in the retina have to compensate with a negative image.
  When I had a blue on black screen, I never noticed this (i.e., I didn't
see orange), but I think that's becasuse the blue used is more like a grey,
while green screens are REALLY green.

B. Walsh