Bonsai wrote:
> 
> Hi,
> 

> groups:
> 
> How can I calculate the grey equivalent of a given rgb color?
> 

It's a bit hidden in the following thread:

Subject: checkered passed
Date: Tue, 14 Nov 2000 23:57:07 -0500
From: "Rick Mabry" <rma### [at] softdiskcom>
Newsgroups: povray.general

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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