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From: montnaro%chenengo.tcpip@GE-CRD.ARPA
Newsgroups: net.micro.atari16
Subject: image compression
Message-ID: <8605211535.AA25611@ucbvax.Berkeley.EDU>
Date: Wed, 21-May-86 11:13:00 EDT
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Posted: Wed May 21 11:13:00 1986
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Received: by chenengo.steinmetz (3.0/1.1x Steinmetz)
	id AA16370; Wed, 21 May 86 10:08:20 EDT
Date: Wed, 21 May 86 10:08:20 EDT
From: Skip Montanaro <montnaro%chenengo.tcpip@csbvax>
Posted-Date: Wed, 21 May 86 10:08:20 EDT
Message-Id: <8605211408.AA16370@chenengo.steinmetz>
To: info-atari16@score.stanford.edu
Subject: image compression


In <752@rclex.UUCP> Walt Weber writes:

>Has anyone ever seen or used an encoding or compression algorithm
>to store image files?  I have seen a couple of demos which appear
>to be compressed, as they are all different sizes and come up in
>a "slideshow" style presentation.

I would think that some adaptation of the algorithm used in compress
(available from mod.sources and quite protable) might be sufficiently fast
enough to do what you want. Compress is not restricted to ASCII files. We
use it to compress cpio output (used for backups) before sending to a VMS
VAX. We get (typically) about 50% compression and its speed is acceptably
fast. 

==========
Skip Montanaro
ARPA: montanaro@ge-crd.arpa
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