Compressing alt.sex.pictures files

[Barry Brown]

In article <1990Aug28.192024.22435 at zorch.SF-Bay.ORG> xanthian at zorch.SF-Bay.ORG (Kent Paul Dolan) writes:
>winans at sirius.mcs.anl.gov (John Winans) writes in news.admin:
>>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.

Problem:

GIF files are already compressed.  If you're talking about compressing GIF
files, you'll need to figure out a way to compress LZW-compressed files.

If, on the other hand, you're talking about compressing the actual image,
then you're headed for trouble because that means defining a whole new
format.  With GIFs already well supported, you (or whoever decides to pursue
this) will be in for a lot of opposition.

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