Path: utzoo!attcan!uunet!lll-winken!lll-lcc!ames!ll-xn!oberon!pollux.usc.edu!papa
From: papa@pollux.usc.edu (Marco Papa)
Newsgroups: comp.sys.amiga
Subject: Re: RGB to HSV Colors
Message-ID: <9410@oberon.USC.EDU>
Date: 28 May 88 03:25:38 GMT
References: <8805271453.AA13503@jade.berkeley.edu>
Sender: news@oberon.USC.EDU
Reply-To: papa@pollux.usc.edu (Marco Papa)
Organization: Felsina Software, Los Angeles, CA
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In article <8805271453.AA13503@jade.berkeley.edu> BBOURBIN@UMDD.BITNET (Brett S Bourbin) writes:
|Does anyone out there know of a formula for converting a RGB (red green blue)
|color value, into a HSV (hue saturation value) one?
|
|I think it is some sort or ratio but I would like to know the "correct"
|method. (Dan Silva, are you out there? 8^) )

Get hold of a copy of "Procedural Elements for Computer Graphics", by David
F. Rogers, McGraw-Hill Book Co., 1985. On page 401 through 406 you will 
find pseudo-pascal code for HSV->RGB, RGB->HSV, HLS->RGB, and RGB->HLS
conversions. It took me about an hour to transform them in C, and all
the algorithms DO work.

This book is in my opinion one of the BEST computer graphics books.  This is 
David's second book (the first one was Mathematical Elements for Computer 
Graphics).  I hear that a third book is or will soon be published.

-- Marco Papa 'Doc'
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