Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uwm.edu!linac!att!ucbvax!hplabs!caine
From: caine@hplabs.hpl.hp.com (Nate Caine)
Newsgroups: comp.graphics
Subject: Re: Need reference for RGB to greyscale formula
Message-ID: <6922@hplabsz.hplabs.hpl.hp.com>
Date: 17 May 91 00:15:38 GMT
References: <9105150458.AA05702@enuxha.eas.asu.edu> <1991May15.052411.22318@ux1.cso.uiuc.edu>
Organization: HPLabs, Palo Alto CA
Lines: 20

In article <1991May15.052411.22318@ux1.cso.uiuc.edu> andreess@mrlaxs.mrl.uiuc.edu (Marc Andreessen) writes:

> (Steve Hollasch) writes:
>>    I'm looking for a reference to cite in my thesis that gives the
>>"Greyscale = 0.299 Red + 0.587 Green + 0.114 Blue" formula.  [...]
>
>_Illumination and Color in Computer Generated Imagery_, Roy Hall, 1989,
>Springer-Verlag, New York, p. 153.
>
>Marc
>
Please DON'T use this book to reference this formula.
Despite being an otherwise excellent book, this equation is
incorrect in Hall's book, and the mistake is repeated pretty
much throughout.

Those of you that downloaded his code (thanks for posting it Roy!)
might want to take note of this.

regards nate caine@hplabs.hpl.hp.com