Xref: utzoo comp.graphics:4010 comp.windows.x:7046
Path: utzoo!attcan!uunet!lll-winken!lll-lcc!ames!eos!jbm
From: jbm@eos.UUCP (Jeffrey Mulligan)
Newsgroups: comp.graphics,comp.windows.x
Subject: Re: Luminance from RGB
Message-ID: <2263@eos.UUCP>
Date: 3 Jan 89 20:06:39 GMT
References: <23105@apple.Apple.COM>
Organization: NASA Ames Research Center, California
Lines: 18

From article <23105@apple.Apple.COM>, by turk@Apple.COM (Ken "Turk" Turkowski):
> A fast but crude method is:
> 
> Y = (R + 2G + B) / 4
> --
> Ken Turkowski @ Apple Computer, Inc., Cupertino, CA
> Internet: turk@apple.com
> Applelink: Turkowski1

Equally fast and crude but probably more accurate:

Y = 2R + 5G + B

-- 

	Jeff Mulligan (jbm@aurora.arc.nasa.gov)
	NASA/Ames Research Ctr., Mail Stop 239-3, Moffet Field CA, 94035
	(415) 694-6290