Xref: utzoo comp.graphics:3995 comp.windows.x:7002
Path: utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!rutgers!apple!turk
From: turk@Apple.COM (Ken "Turk" Turkowski)
Newsgroups: comp.graphics,comp.windows.x
Subject: Re: Luminance from RGB
Message-ID: <23105@apple.Apple.COM>
Date: 31 Dec 88 09:06:31 GMT
References: <8811042303.AA21505@dawn.steinmetz.GE.COM> <8811070533.AA08904@vector.sun.com> <8811080030.AA14681@EXPO.LCS.MIT.EDU> <76649@sun.uucp> <6698@watcgl.waterloo.edu> <964@bacchus.dec.com>
Organization: Advanced Technology Graphics, Apple Computer, Cupertino, CA, USA
Lines: 8

A fast but crude method is:

Y = (R + 2G + B) / 4
--
Ken Turkowski @ Apple Computer, Inc., Cupertino, CA
Internet: turk@apple.com
Applelink: Turkowski1