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From: mwherman@watcgl.UUCP (Michael W. Herman)
Newsgroups: net.graphics
Subject: Re: rasterops
Message-ID: <2589@watcgl.UUCP>
Date: Wed, 2-Oct-85 09:17:13 EDT
Article-I.D.: watcgl.2589
Posted: Wed Oct  2 09:17:13 1985
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Organization: Computer Graphics Laboratory, U of Waterloo, Ontario
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A good reference for Ken Turkowski's 'MIX' operator is:

Thomas Porter and Tom Duff, "Compositing Digital Images", SIGGRAPH '84
Conference Proceedings, pp. 253-259.