Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!dali.cs.montana.edu!nero!icsu8053
From: icsu8053@nero.cs.montana.edu (Craig Pratt)
Newsgroups: comp.sys.amiga.advocacy
Subject: Re: AMIGA
Summary: JPEG is flexable
Message-ID: <3956@dali>
Date: 12 May 91 19:54:11 GMT
References: <1991May8.062658.14796@cunixf.cc.columbia.edu> <1991May9.175041.3254@sugar.hackercorp.com> <953@cns.SanDiego.NCR.COM>
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Organization: Montana State University, Dept. of Computer Science, Bozeman MT 59717
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In article <953@cns.SanDiego.NCR.COM> dltaylor@cns.SanDiego.NCR.COM (Dan Taylor) writes:
>In <1991May9.175041.3254@sugar.hackercorp.com> peter@sugar.hackercorp.com (Peter da Silva) writes:
>
>>The IFF RLL compression does, pretty well. Better would be JPEG, which not
>>only decompresses fast (though compression is a bitch) but gets 20:1
>>ratios with minimal loss of information. Not what you'd use for your art
>>prints, but quite good enough for animation.
>
>NO! NO! NO! NO! NO! NO! NO! NO! NO! NO! NO! NO! NO! NO! NO! 
>
>JPEG DOES NOT GIVE EXACT RESTORATION (as you said)!  Therefore, IMHO, it
>is a "toy" alogorithm, useful only for braindead systems like Gates'
>286-based multimedia system.

YES! YES! YES!........

JPEG CAN GIVE EXACT (LOSSLESS) REPRODUCTION!!  The picture quality is
determined by a set of parameters.  Of course, compression decreases 
as it aproaches lossless compression.  JPEG is hardly a "toy" algorithm.
BTW, NeXTStep 2.0+ includes JPEG support.

>Real computers do not have to resort to this algorithm, since they are
>perfectly able to restore compressed images, without data loss, in a
>reasonable time.  The ANIM format, which compresses in the 4th dimension,
>time (by storing frame deltas), gives reasonable compression, without
>data loss, a can be restored in real-time, or processors faster than
>the 7.19 MHz 68000, like a 25MHz 68030.
>
>Dan Taylor

JPEG, however, is not intended for animation.  MPEG is for animation.
MPEG uses interframe (delta) encoding as well as a number of other
encoding methods.  It. like MPEG, is very flexable as well.  See the
April 1991 issue of Communications of the ACM if you're interested.

--
 Craig Pratt                                           icsu8053@cs.montana.edu
 Montana State University, Bozeman MT        Craig.Pratt@msu3.oscs.montana.edu
 "It's a Buddist meditation technique; it focuses your aggression.  The monks
  used to do it before they went into battle.", Otto, _A_Fish_Called_Wanda_