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>From spencer@crim.eecs.umich.edu Tue Feb  2 16:30:48 1988
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From: spencer@spline (Spencer W. Thomas)
Newsgroups: comp.graphics
Subject: Re: RGB to printer CMYK conversion
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Date: 2 Feb 88 21:30:48 GMT
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Paul's code is good, as far as it goes.  There is a more complete discussion of
this topic in the most recent (Third issue 1987 = Vol 1, No 3) PostScript
Language Journal.  It goes into derivation details and talks about alignment of
halftone screens.  One thing that is discussed there that Paul's code doesn't
do is "undercolor removal".  This is necessary because the inks aren't pure,
thus magenta ink typically appears to be contaminated by yellow, for example.
The code is similar to that used for black removal.

Anyway, the PSLJ is available from 
	The PSLJ
	P.O. Box 5763
	Parsippany, NJ  07054

Single issues are $5.

[I have no association with the PSLJ other than that of a happy reader.]
=Spencer (spencer@crim.eecs.umich.edu)