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From: hutch@sdcsvax.UCSD.EDU (Jim Hutchison)
Newsgroups: comp.graphics
Subject: RGB --> CMYB, OOPS.
Message-ID: <3291@sdcsvax.UCSD.EDU>
Date: Tue, 9-Jun-87 03:27:01 EDT
Article-I.D.: sdcsvax.3291
Posted: Tue Jun  9 03:27:01 1987
Date-Received: Thu, 11-Jun-87 06:35:33 EDT
Reply-To: hutch@sdcsvax.UCSD.EDU (Jim Hutchison)
Organization: UCSD EMU Project (Educational Microcomputer Unix)
Lines: 22
Keywords: stupid

<>
Boy do I feel dumb.  Additive vs. Subtractive colors.  Ignore the previous
articles formula, I was drugged, being held hostage, tired, possessed...

In a prefect world (prefect ink, 255 is full on, 0 is full off): 

RGB --> CYM

	C = 255 - R       Y = 255 - B       M = 255 - G

CYM --> CYMB

	Take the least component of CYM, and make it B.  Subtract
	B from CYM.

In the real world there is correction for organic dyes, but as it is
getting late I think best to stop before I have to post more tomorrow.

-- 
    Jim Hutchison   		UUCP:	{dcdwest,ucbvax}!sdcsvax!hutch
		    		ARPA:	Hutch@sdcsvax.ucsd.edu
Disclaimer:  I'm gone, really, away from my terminal, in the tub, honest.