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From: falk%peregrine@Sun.COM (Edward Falk)
Newsgroups: comp.graphics
Subject: Re: Converting RGB <-> HSV
Message-ID: <33900@sun.uucp>
Date: Fri, 13-Nov-87 21:19:29 EST
Article-I.D.: sun.33900
Posted: Fri Nov 13 21:19:29 1987
Date-Received: Sun, 15-Nov-87 12:03:31 EST
References: <6781@bbn.COM> <7018@pur-ee.UUCP>
Sender: news@sun.uucp
Reply-To: falk@sun.UUCP (Edward Falk)
Organization: Sun Microsystems, Mountain View
Lines: 22

In article <7018@pur-ee.UUCP> 3ksnn64@pur-ee.UUCP (Joe Cychosz) writes:
>
>
>RGB to grayscale:
>
>	Y = .59*R + .11*G + .33*B
>

EEEEAAAAAYYYYAAAGGGGHHH!!!!  This is WRONG!  Your numbers don't even
add up to 1.0

	Y = .30*R + .59*G + .11*B

Look at a chart someday that describes the eye's sensitivity to the three
colors.  You'll see that blue is the least sensitive.  Film has a different
spectrum, which is why blue objects in a B&W picture look lighter than
you remember them.


		-ed falk, sun microsystems
		 sun!falk, falk@sun.com
I'll take a drug test when Oliver North takes a lie detector test.