Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!cs.utexas.edu!uunet!seismo!esosun!cogen!celerity!celit!hutch
From: hutch@celerity.uucp (Jim Hutchison)
Newsgroups: comp.graphics
Subject: Re: Color Quantization
Message-ID: <318@celit.UUCP>
Date: 30 May 89 17:17:33 GMT
References: <310@celit.UUCP>
Sender: news@celerity
Reply-To: hutch@celerity.UUCP (Jim Hutchison)
Organization: FPS Computing
Lines: 12

In using a mean-cut or weighted-median-cut algorithm for quantizing colors,
there is another consideration to add other than just where on the line to
make the cut.  There is how to make the line.  Since we humans have a greater
perception of grey scale than of color shift, and a greater sensitivity to
green than red than blue.  There is a certain amount of improvement which
can be gained by doing division by grey scale and weighting for grey more
strongly than color, green more strongly than red, and red more strongly
than blue.  This would also probably help to maintain the contrast of the
image.

/*    Jim Hutchison   		{dcdwest,ucbvax}!ucsd!celerity!hutch  */
/*    Disclaimor:  I am not an official spokesman for FPS computing   */