Path: utzoo!attcan!uunet!cs.utexas.edu!tut.cis.ohio-state.edu!purdue!decwrl!fernwood!c3!silva
From: silva@c3.PLA.CA.US (Joe Silva)
Newsgroups: comp.graphics
Subject: Re: Color Quantization
Keywords: Color, RGB, Image Processing
Message-ID: <133@c3.PLA.CA.US>
Date: 8 Jun 89 21:57:00 GMT
References: <281@irst.UUCP>
Reply-To: silva@c3.UUCP (Joe Silva)
Organization: Creative Circuits Corp., Palo Alto, CA
Lines: 2

Dithering helps a lot. Check out Siggraph'82 Proceedings (Vol 16, Num 3) 
Page 297.