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Path: utzoo!utgpu!water!watnot!watmath!clyde!rutgers!cbmvax!carolyn
From: carolyn@cbmvax.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: RGB <-> HLS
Message-ID: <1646@cbmvax.cbmvax.cbm.UUCP>
Date: Wed, 8-Apr-87 16:07:31 EST
Article-I.D.: cbmvax.1646
Posted: Wed Apr  8 16:07:31 1987
Date-Received: Sat, 11-Apr-87 07:46:48 EST
References: <2848@sunybcs.UUCP>
Reply-To: carolyn@cbmvax.UUCP (Carolyn Scheppner CATS)
Organization: Commodore Technology, West Chester, PA
Lines: 30
Keywords: color, palettes, conversion, confusion, help, aaaaaaaaahhhh

In article <2848@sunybcs.UUCP> ugpete@sunybcs.UUCP (Peter Theobald) writes:

>	It's pretty strange... I found at least 5 different sources ('c' code,
>textbooks, people, etc...) that explain RGB <-> HVS, but nowhere RGB <-> HLS!!
>	I NEED this algorithm fast, it's for a project and other people are
>waiting for my part!!!! So please help!!!!!

   The excellent book "Procedural Elements for Computer Graphics" by
David F. Rogers (McGraw-Hill) contains pseudocode for RGB <-> HLS.

   I would post the code but

      a. I don't have time to type it in
      b. It would be copyright infringement

   You could try calling New York City information (1-212-555-1212 ?)
to get the number of McGraw-Hill.  You may be able to order the book
directly from them or from their massive professional book store in
Manhattan (that's where I got mine).  

   The book covers drawing algorithms, data encoding, fills, anti-aliasing,
half-toning, clipping, hidden lines, ray tracing, illumination, texture
mapping, and color.

-- 
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Carolyn Scheppner -- CBM   >>Amiga Technical Support<<
                     UUCP  ...{allegra,caip,ihnp4,seismo}!cbmvax!carolyn 
                     PHONE 215-431-9180
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