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From: marks@galadriel.bt.co.uk (Mark Shackleton)
Newsgroups: comp.graphics
Subject: Re: RGB to gray
Message-ID: <1990Nov20.105041.19140@galadriel.bt.co.uk>
Date: 20 Nov 90 10:50:41 GMT
References: <1990Nov19.050822.12771@metro.ucc.su.OZ.AU>
Organization: RT611 BTRL, Martlesham Heath, Ipswich, UK
Lines: 15

From article <1990Nov19.050822.12771@metro.ucc.su.OZ.AU>, by andrew@ee.su.oz.au (Andrew Ho):

>   I am trying to convert some full color images (RGB) into
> gray level images (because I hope to get some non-colorful
> laser printouts after doing the convertion).
>  
>   Are there any algorithms/lookup tables to do the "RGB to 
> gray level" matching ? 
> 

Use:  Y = .299 R + .587 G + .114 B

This will give the luminance (greylevel) 'Y' for the given RGB values.

Regards, Mark Shackleton