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From: del@thrush.mlb.semi.harris.com (Don Lewis)
Newsgroups: alt.sources.d
Subject: Re: Compressing alt.sex.pictures files
Message-ID: <1990Aug29.001654.26891@mlb.semi.harris.com>
Date: 29 Aug 90 00:16:54 GMT
References: <1990Aug27.154419.25882@mcs.anl.gov> <1990Aug28.192024.22435@zorch.SF-Bay.ORG>
Sender: news@mlb.semi.harris.com
Organization: Harris Semiconductor, Melbourne FL
Lines: 19

In article <1990Aug28.192024.22435@zorch.SF-Bay.ORG> xanthian@zorch.SF-Bay.ORG (Kent Paul Dolan) writes:
>winans@sirius.mcs.anl.gov (John Winans) writes in news.admin:
>>HOWEVER:
>>What a.s.p might be good for is a place to test image compression programs
>>and stuff like that.  The acive users of the group would probably not want
>>to see it go away and might be willing to work with others to try to reduce
>>it's load on the net.
>
>Hmmm.  Good idea.  Here's one suggestion for an experiment.  Somewhere on
>the net, a month or two back, there was a suggestion that a good way to
>compress realistic images was to XOR scan lines after the first with their
>predecessor line, then LZW compress the output.

Taking differences between the scan lines instead of doing XOR's might
also be interesting.
--
Don "Truck" Lewis                      Harris Semiconductor
Internet:  del@mlb.semi.harris.com     PO Box 883   MS 62A-028
Phone:     (407) 729-5205              Melbourne, FL  32901