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From: 3ksnn64@pur-ee.UUCP (Joe Cychosz)
Newsgroups: comp.graphics
Subject: Re: Converting RGB <-> HSV
Message-ID: <7018@pur-ee.UUCP>
Date: Fri, 13-Nov-87 15:23:44 EST
Article-I.D.: pur-ee.7018
Posted: Fri Nov 13 15:23:44 1987
Date-Received: Sun, 15-Nov-87 10:48:04 EST
References: <6781@bbn.COM>
Reply-To: 3ksnn64@pur-ee.UUCP (Joe Cychosz)
Organization: Purdue University Engineering Computer Network
Lines: 15

In article <6781@bbn.COM> cosell@bbn.com.UUCP (Bernie Cosell) writes:
>
>Does anyone have the formulae for converting Red/Green/Blue color
>specs to and from Hue/Saturation/Value specs?  Also, does anyone
>have the equation for converting color->grayscale?  Thanks


RGB to grayscale:

	Y = .59*R + .11*G + .33*B

RGB to/from HSV:

	This is discussed in Foley and Van Dam book "Fundementals of
	Interactive Computer Graphics."