Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!uunet!dg!podlipec
From: podlipec@dg.dg.com (Mark Podlipec)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Selecting HAM mode base colours
Keywords: HAM
Message-ID: <579@dg.dg.com>
Date: 30 Jun 90 17:56:11 GMT
Reply-To: podlipec@dg.UUCP (Mark Podlipec)
Organization: Data General, Westboro, MA.
Lines: 18


Derek descibed Paul's algorithm in a previous post so I won't repeat, but 
I've found it works fairly well.
I've played around with where you make the 'cut' when dividing the 
boxes. Instead of splitting based on the median color, take into
account the number of pixels and split at the median pixel. I've found
this on average to produce better HAM images(closer to the original GIF). 

On the side, I've been playing with creating Dynamic Hi-Res and for the
most part they look good, except on some images my current algorithm
generates some horizontal banding due to treating each line separately.
Has anyone written code to take adjacent lines into account during color 
selection and would like to offer suggestions? 

                           Mark Podlipec 

"Can't you see the falling petals?"  - Naja
"uh?"                                - Dave Betsonski