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1994-12-22
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The Independent JPEG Group's JPEG software
==========================================
README for release 5 of 24-Sep-94
=================================
This distribution contains the fifth public release of the Independent JPEG
Group's free JPEG software.
This software is the work of Tom Lane, Philip Gladstone, Luis Ortiz, Jim
Boucher, Lee Crocker, George Phillips, Davide Rossi, Ge' Weijers, and other
members of the Independent JPEG Group.
IJG is not associated with the official ISO JPEG standards committee.
This port (actually =compilation) was done by Jarkko Kniivila, and was
(re-)done because someone released a buggy port of IJG jpeg v.5
software with incomplete documentation. This one should work okay
starting from on a STfm; allthough I can't garantee it because I
crosscompiled the binaries on my Amiga with gcc! This probably makes
all Atarians spit green comets on my Virtual Image but I assure you
that the binaries have been tested OK on my friend's machine.
Moreover, we measured the speed of cjpeg/djpeg agains the old versions
(v.4) and concluded a more than 30% increase in speed! This can be
explained by the fact that the effective multiplications needed to do
(straigh/inverse) DCT (needed by the compression/decompression
respectively) was halved in the source code by rearrangements. A big
hurray for the IJG team!
I used the sources distributed at AMINET (AMINET:/gfx/conv/
jpegv5src.lha) sites which had the original jpegsrc.v5.tar.gz archive
(from ftp.uu.net) included unmodified as a subdirectory. If you want
to recompile, grab the file `jpegv5s.zip' in the same directory you
found this binary release; it includes a Makefile and jconfig.h
suitable for gcc + MiNTlibs. There are also files for building with
PureC/TurboC (from the original distribution).
Before somebody complains why I didn't compile cjpeg and djpeg to
take a two argument commandline, I have to defend that it is not needed
in the current version, because there's a new option (-outfile):
To decompress a jpeg to a gif, say either
`djpeg -outfile example.gif example.jpg'
or (in a command line shell)
`djpeg example.jpg > example.gif'
The same principle applies to cjpeg as well.
The documentation in the package is provided as UNIX manual pages and
as the file `usage.doc'. The man pages (*.man) are preformatted and
suitable input eg., for Less. There are also TeX DVI files (*.dvi)
for those who prefer a dvi-viewer (or printing the pages).
My address:
electronic mail: normal mail:
**************** ************
Jarkko.Kniivila@cc.tut.fi Jarkko Kniivila
Opiskelijankatu 4 F 315
FIN-33720 TAMPERE
Finland