Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!tut.cis.ohio-state.edu!ucbvax!ucdavis!iris!foss
From: foss@iris.ucdavis.edu (Jim Alves-Foss)
Newsgroups: comp.graphics
Subject: Re: RGB to Hue/Saturation/Luminence
Message-ID: <4759@ucdavis.ucdavis.edu>
Date: 27 Jun 89 16:12:59 GMT
References: <2922@ukecc.engr.uky.edu>
Sender: uucp@ucdavis.ucdavis.edu
Reply-To: foss@iris.ucdavis.edu (Jim Alves-Foss)
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Organization: U.C. Davis - Department of Electrical Engineering and Computer Science
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In article <2922@ukecc.engr.uky.edu> agollum@ukecc.UUCP (Kenneth Herron) writes:
>....  Does anyone have the formulas to convert
>from RGB to HSL?  Or know of a good algorithm for doing these things?
>(more details available on request)

The book:
David F. Rogers, "Procedural Elements for Computer Graphics", McGraw-Hill 1985
has pseudocode algorithms for RGB<-->(HLS|HSV) starting on page 401. His 
descriptions of these methods is also understandable.

If you can't find it, I'll dig up my 'C' versions and send them to you.

-Jim Alves-Foss (foss@iris.ucdavis.edu)  /* Of course these are MY opinions */