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From: kurtk@tektronix.UUCP (Kurt Krueger)
Newsgroups: net.graphics
Subject: Re: Solarization and Posterization
Message-ID: <5750@tektronix.UUCP>
Date: Tue, 24-Sep-85 16:12:46 EDT
Article-I.D.: tektroni.5750
Posted: Tue Sep 24 16:12:46 1985
Date-Received: Sat, 28-Sep-85 05:06:23 EDT
References: <6700033@datacube.UUCP> <2227@ukma.UUCP>
Reply-To: kurtk@tektronix.UUCP (Kurt Krueger)
Organization: Tektronix, Beaverton OR
Lines: 15


	Solarization is, as has been stated, the exposure of a partially
developed print or negative to light.  The reason that it works is that
the silver's sensitivity to light changes depending on how much density
(i.e. how black it is) has been built up.  I don't know why.  It has
also been my experiance that is works better with negatives than with
prints.

	Posterization is the quantization of grey scale, color etc.  A
posterized b&w print has a finite number of grey tones, rather than a
continuous tone.  I've been told that posters (you know, those large
printed pictures) can be made this way.  It is a trade off between
resolution and grey scale.  You can either get your grey scale by doing
a half tone representation (and create a grainey picture) or by quantizing
the grey scale (no grain, sharp edges, but limited grey scale).


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