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!ChangeFSI/JPEGinfo
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
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Duplicates
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File contents
The Independent JPEG Group's JPEG software
==========================================
README for release 3 of 17-Mar-92
==================================
This distribution contains the third official release of the Independent JPEG
Group's free JPEG software. You are welcome to redistribute this software and
to use it for any purpose, subject to the conditions under LEGAL ISSUES, below.
For usage instructions, see section USAGE.
This software is still undergoing revision. Updated versions may be obtained
by FTP or UUCP to UUNET and other archive sites; see ARCHIVE LOCATIONS below
for details.
If you intend to become a serious user of this software, please contact
jpeg-info@uunet.uu.net to be added to our electronic mailing list. Then
you'll be notified of updates and have a chance to participate in discussions,
etc.
This software is the work of Tom Lane, Philip Gladstone, Luis Ortiz,
Lee Crocker, Ge' Weijers, and other members of the Independent JPEG Group.
DISCLAIMER
==========
THIS SOFTWARE IS NOT COMPLETE NOR FULLY DEBUGGED. It is not guaranteed to be
useful for anything, nor to be compatible with subsequent releases, nor to be
an accurate implementation of the JPEG standard. (See LEGAL ISSUES for even
more disclaimers.)
Please report any problems with this software to jpeg-info@uunet.uu.net.
WHAT'S HERE
===========
This distribution contains compiled C software to implement JPEG image
compression and decompression. JPEG (pronounced "jay-peg") is a standardized
compression method for full-color and gray-scale images. JPEG is intended for
"real-world" scenes; cartoons and other non-realistic images are not its strong
suit. JPEG is lossy, meaning that the output image is not necessarily
identical to the input image. Hence you should not use JPEG if you have to
have identical output bits. However, on typical images of real-world scenes,
very good compression levels can be obtained with no visible change, and
amazingly high compression levels can be obtained if you can tolerate a
low-quality image. For more details, see the references, or just experiment
with various compression settings.
The software implements JPEG baseline and extended-sequential compression
processes. Provision is made for supporting all variants of these processes,
although some uncommon parameter settings aren't implemented yet. For legal
reasons, we are not distributing code for the arithmetic-coding process; see
LEGAL ISSUES. At present we have made no provision for supporting the
progressive, hierarchical, or lossless processes defined in the standard.
The present software is not far beyond the prototype stage. It does not
support all possible variants of the JPEG standard, and some functions have
rather slow and/or crude implementations. However, it is useful already.
The emphasis in designing this software has been on achieving portability and
flexibility, while also making it fast enough to be useful. We have not yet
undertaken serious performance measurement or tuning; we intend to do so in
the future.
In particular, we welcome the use of this software as a component of commercial
products; no royalty is required.
ARCHIVE LOCATIONS
=================
The "official" archive site for this software (including the source) is
ftp.uu.net (Internet address 137.39.1.9 or 192.48.96.9). The most recent
released version can always be found there in directory graphics/jpeg. This
particular version will be archived as jpegsrc.v3.tar.Z. If you are on the
Internet, you can retrieve files from UUNET by anonymous FTP. If you don't
have FTP access, UUNET's archives are also available via UUCP; contact
postmaster@uunet.uu.net for information on retrieving files that way.
Various other Internet sites maintain copies of the UUNET file, which may or
may not be up-to-date. In Europe, try nic.funet.fi (128.214.6.100; look in
directory pub/graphics/programs/jpeg).
You can also obtain this software from CompuServe, in the GRAPHSUPPORT forum
(GO PICS), library 10; this version will be file jpsrc3.zip.
SOFTWARE THAT'S NO HELP AT ALL
==============================
Handmade Software's shareware PC program GIF2JPG produces files that are
totally incompatible with our programs. They use a proprietary format that is
an amalgam of GIF and JPEG representations. However, you can force GIF2JPG
to produce compatible files with its -j switch, and their decompression
program JPG2GIF can read our files (at least ones produced with our default
option settings).
Unfortunately, many commercial JPEG implementations are also incompatible as
of this writing, especially programs released before summer 1991. The root of
the problem is that the ISO JPEG committee failed to specify a concrete file
format. Some vendors "filled in the blanks" on their own, creating
proprietary formats that no one else could read. (For example, none of the
early commercial JPEG implementations for the Macintosh were able to exchange
compressed files.)
The file format we have adopted is called JFIF (see REFERENCES). This format
has been agreed to by a number of major commercial JPEG vendors, and we expect
that it will become the de facto standard. JFIF is a minimal representation;
work is also going forward to incorporate JPEG compression into the TIFF
standard, for use in "high end" applications that need to record a lot of
additional data about an image. We intend to support JPEG-in-TIFF in the
future. We hope that these two formats will be sufficient and that other,
incompatible JPEG file formats will not proliferate.
Indeed, part of the reason for developing and releasing this free software is
to help force rapid convergence to de facto standards for JPEG file formats.
SUPPORT STANDARD, NON-PROPRIETARY FORMATS: demand JFIF or JPEG-in-TIFF!
REFERENCES
==========
The best and most readily available introduction to the JPEG compression
algorithm is Wallace's article in the April '91 CACM:
Wallace, Gregory K. "The JPEG Still Picture Compression Standard",
Communications of the ACM, April 1991 (vol. 34 no. 4), pp. 30-44.
(Adjacent articles in that issue discuss MPEG motion picture compression,
applications of JPEG, and related topics.) We highly recommend reading that
article before trying to understand the innards of any JPEG software.
If you don't have the CACM issue handy, a PostScript file containing a revised
version of the article is available at ftp.uu.net, graphics/jpeg/wallace.ps.Z.
The file (actually a preprint for an article to appear in IEEE Trans. Consumer
Electronics) omits the sample images that appeared in CACM, but it includes
corrections and some added material. Note: the Wallace article is copyright
ACM and IEEE, and it may not be used for commercial purposes.
For more detail about the JPEG standard you pretty much have to go to the
draft standard (which is not nearly as intelligible as Wallace's article).
The standard is not now available electronically; you must order a paper copy
through ISO. In the US, copies may be ordered from ANSI Sales at (212)
642-4900. The standard is divided into two parts: Part 1 is the actual
specification, and Part 2 covers compliance testing methods. The current
"committee draft" version of Part 1 is titled "Digital Compression and Coding
of Continuous-tone Still Images, Part 1: Requirements and guidelines" and has
document number ISO/IEC CD 10918-1. (The alternate number SC2 N2215 should
also be mentioned when ordering.) This draft is expected to be superseded by
the Draft International Standard version around the end of November 1991.
Ordering info will be the same as above, but replace "CD" with "DIS" in the
document number (alternate number not yet known). The committee draft of
Part 2 is expected to be available around the end of December 1991. It will
be titled "Digital Compression and Coding of Continuous-tone Still Images,
Part 2: Compliance testing" and will have document number ISO/IEC CD 10918-2
(alternate number not yet known).
The JPEG standard does not specify all details of an interchangeable file
format. For the omitted details we follow the "JFIF" conventions, revision
1.01. A copy of the JFIF spec is available from:
Literature Department
C-Cube Microsystems, Inc.
399A West Trimble Road
San Jose, CA 95131
(408) 944-6300
The same source can supply copies of the draft JPEG-in-TIFF documents
(Appendixes O and P to the TIFF spec). PostScript versions of these
documents can also be obtained by e-mail from the C-Cube mail server,
netlib@c3.pla.ca.us. Send the message "send jfif_ps from jpeg" to obtain the
JFIF document; "send app_o_ps from jpeg" and "send app_p_ps from jpeg" will
produce the TIFF documents. Send the message "help" if you have trouble.
LEGAL ISSUES
============
The authors make NO WARRANTY or representation, either express or implied,
with respect to this software, its quality, accuracy, merchantability, or
fitness for a particular purpose. This software is provided "AS IS", and you,
its user, assume the entire risk as to its quality and accuracy.
This software is copyright (C) 1991, 1992, Thomas G. Lane.
All Rights Reserved except as specified below.
Permission is hereby granted to use, copy, modify, and distribute this
software (or portions thereof) for any purpose, without fee, subject to these
conditions:
(1) If any part of the source code for this software is distributed, then this
README file must be included, with this copyright and no-warranty notice
unaltered; and any additions, deletions, or changes to the original files
must be clearly indicated in accompanying documentation.
(2) If only executable code is distributed, then the accompanying
documentation must state that "this software is based in part on the work of
the Independent JPEG Group".
(3) Permission for use of this software is granted only if the user accepts
full responsibility for any undesirable consequences; the authors accept
NO LIABILITY for damages of any kind.
Permission is NOT granted for the use of any author's name or author's company
name in advertising or publicity relating to this software or products derived
from it. This software may be referred to only as "the Independent JPEG
Group's software".
We specifically permit and encourage the use of this software as the basis of
commercial products, provided that all warranty or liability claims are
assumed by the product vendor.
It appears that the arithmetic coding option of the JPEG spec is covered by
patents owned by IBM and AT&T, as well as a pending Japanese patent of
Mitsubishi. Hence arithmetic coding cannot legally be used without obtaining
one or more licenses. For this reason, support for arithmetic coding has been
removed from the free JPEG software. (Since arithmetic coding provides only a
marginal gain over the unpatented Huffman mode, it is unlikely that very many
people will choose to use it. If you do obtain the necessary licenses,
contact jpeg-info@uunet.uu.net for a copy of our arithmetic coding modules.)
So far as we are aware, there are no patent restrictions on the remaining
code.
We are required to state that
"The Graphics Interchange Format(c) is the Copyright property of
CompuServe Incorporated. GIF(sm) is a Service Mark property of
CompuServe Incorporated."
TO DO
=====
Many of the modules need fleshing out to provide more complete
implementations, or to provide faster paths for common cases.
Improving the speed will be the next big work item for the JPEG group.
We'd appreciate it if people would compile and check out the code on as wide a
variety of systems as possible, and report any portability problems
encountered (with solutions, if possible). Checks of file compatibility with
other JPEG implementations would also be of interest. Finally, we would
appreciate code profiles showing where the most time is spent, especially on
unusual systems.
Please send bug reports, offers of help, etc. to jpeg-info@uunet.uu.net.
USAGE instructions for the Independent JPEG Group's JPEG software
=================================================================
GENERAL USAGE
We provide two programs, cjpeg to compress an image file into JPEG format,
and djpeg to decompress a JPEG file back into a conventional image format.
On Unix-like systems, you say:
cjpeg [switches] [imagefile] >jpegfile
or
djpeg [switches] [jpegfile] >imagefile
The programs read the specified input file, or standard input if none is
named. They always write to standard output (with trace/error messages to
standard error). These conventions are handy for piping images between
programs.
On most non-Unix systems, you say:
cjpeg [switches] imagefile jpegfile
or
djpeg [switches] jpegfile imagefile
i.e., both the input and output files are named on the command line. This
style is a little more foolproof, and it loses no functionality if you don't
have pipes. (You can get this style on Unix too, if you prefer, by defining
TWO_FILE_COMMANDLINE when you compile the programs; see SETUP.)
The currently supported image file formats are: PPM (PBMPLUS color format),
PGM (PBMPLUS gray-scale format), GIF and Targa. cjpeg recognizes the input
image format automatically, with the exception of some Targa-format files. You
have to tell djpeg which format to generate (PPM by default).
The only JPEG file format currently supported is the JFIF format. Support for
the TIFF/JPEG format will probably be added at some future date.
CJPEG DETAILS
The command line switches for cjpeg are:
-Q quality Scale quantization tables to adjust image quality.
Quality is 0 (worst) to 100 (best); default is 75.
(See below for more info.)
-o Perform optimization of entropy encoding parameters.
Without this, default encoding parameters are used.
-o usually makes the JPEG file a little smaller, but
cjpeg runs somewhat slower and needs much more memory.
Image quality and speed of decompression are unaffected
by -o.
-T Input file is Targa format. Targa files that contain
an "identification" field will not be automatically
recognized by cjpeg; for such files you must specify
-T to force cjpeg to treat the input as Targa format.
-I Generate noninterleaved JPEG file (not yet supported).
-a Use arithmetic coding rather than Huffman coding.
(Not currently supported for legal reasons.)
-d Enable debug printout. More -d's give more printout.
Also, version information is printed at startup.
-m memory Set limit for amount of memory to use in processing
large images. Value is in thousands of bytes, or
millions of bytes if "M" is attached to the number.
For example, -m 4m selects 4000000 bytes. If more
space is needed, temporary files will be used.
The -Q switch lets you trade off compressed file size against quality of the
reconstructed image: the higher the -Q setting, the larger the JPEG file, and
the closer the output image will be to the original input. Normally you want
to use the lowest -Q setting (smallest file) that decompresses into something
visually indistinguishable from the original image. For this purpose the -Q
setting should be between 50 and 95; the default of 75 is often about right.
If you see defects at -Q 75, then go up 5 or 10 counts at a time until you are
happy with the output image. (The optimal setting will vary from one image to
another.)
-Q 100 will generate a quantization table of all 1's, eliminating loss in the
quantization step (but there is still information loss in subsampling, as well
as roundoff error). This setting is mainly of interest for experimental
purposes. -Q values above about 95 are NOT recommended for normal use; the
compressed file size goes up dramatically for hardly any gain in output image
quality.
In the other direction, -Q values below 50 will produce very small files of
low image quality. Settings around 5 to 10 might be useful in preparing an
index of a large image library, for example. Try -Q 2 (or so) for some
amusing Cubist effects. (Note: -Q values below about 25 generate 2-byte
quantization tables, which are considered optional in the JPEG standard.
cjpeg emits a warning message when you give such a -Q value, because some
commercial JPEG programs may be unable to decode the resulting file.)
DJPEG DETAILS
The command line switches for djpeg are:
-G Select GIF output format (implies -q, with default
of 256 colors).
-P Select PPM or PGM output format (this is the default).
PGM is emitted if the JPEG file is gray-scale or if -g
is specified.
-R Select RLE output format. Requires URT library.
-T Select Targa output format. Gray-scale format is
emitted if the JPEG file is gray-scale or if -g is
specified; otherwise, colormapped format is emitted
if -q is specified; otherwise, 24-bit full-color
format is emitted.
-g Force gray-scale output even if input is color.
-q N Quantize to N colors. This reduces the number of
colors in the output image so that it can be displayed
on a colormapped display or stored in a colormapped
file format. For example, if you have an 8-bit
display, you'd need to quantize to 256 or fewer colors.
-D Do not use dithering in color quantization.
By default, Floyd-Steinberg dithering is applied when
quantizing colors, but on some images dithering may
result in objectionable "graininess". If that
happens, you can turn off dithering with -D.
-D is ignored unless you also say -q or -G.
-1 Use one-pass instead of two-pass color quantization.
The one-pass method is faster and needs less memory,
but it produces a lower-quality image.
-1 is ignored unless you also say -q or -G. Also,
the one-pass method is always used for gray-scale
output (the two-pass method is no improvement then).
-b Perform cross-block smoothing. This is quite
memory-intensive and only seems to improve the image
at very low quality settings (-Q 10 to 20 or so).
At normal -Q settings it may make the image worse.
-d Enable debug printout. More -d's give more printout.
Also, version information is printed at startup.
-m memory Set limit for amount of memory to use in processing
large images. Value is in thousands of bytes, or
millions of bytes if "M" is attached to the number.
For example, -m 4m selects 4000000 bytes. If more
space is needed, temporary files will be used.
HINTS
Avoid running an image through a series of JPEG compression/decompression
cycles. Image quality loss will accumulate; after ten or so cycles the image
may be noticeably worse than it was after one cycle. It's best to use a
lossless format while manipulating an image, then convert to JPEG format when
you are ready to file the image away.
The -o option to cjpeg is worth using when you are making a "final" version
for posting or archiving. It's also a win when you are using low -Q settings
to make very small JPEG files; the percentage improvement is often a lot more
than it is on larger files.
The default memory usage limit (-m) is set when the software is compiled.
If you get an "insufficient memory" error, try specifying a smaller -m value,
even -m 0 to use the absolute minimum space. You may want to recompile with
a smaller default value if this happens often.
djpeg with two-pass color quantization requires a good deal of space; on
MS-DOS machines it may run out of memory even with -m 0. In that case you
can still decompress, with some loss of image quality, by specifying -1
for one-pass quantization.
If more space is needed than will fit in the available main memory (as
determined by -m), temporary files will be used. The temporary files are often
rather large: in typical cases they occupy three bytes per pixel, for example
3*800*600 = 1.44Mb for an 800x600 image. If you don't have enough free disk
space, leave out -o (for cjpeg) or specify -1 (for djpeg).
00000000 54 68 65 20 49 6e 64 65 70 65 6e 64 65 6e 74 20 |The Independent | 00000010 4a 50 45 47 20 47 72 6f 75 70 27 73 20 4a 50 45 |JPEG Group's JPE| 00000020 47 20 73 6f 66 74 77 61 72 65 0a 3d 3d 3d 3d 3d |G software.=====| 00000030 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d |================| * 00000050 3d 3d 3d 3d 3d 0a 0a 52 45 41 44 4d 45 20 66 6f |=====..README fo| 00000060 72 20 72 65 6c 65 61 73 65 20 33 20 6f 66 20 20 |r release 3 of | 00000070 31 37 2d 4d 61 72 2d 39 32 0a 3d 3d 3d 3d 3d 3d |17-Mar-92.======| 00000080 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d |================| 00000090 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 0a 0a 54 68 |============..Th| 000000a0 69 73 20 64 69 73 74 72 69 62 75 74 69 6f 6e 20 |is distribution | 000000b0 63 6f 6e 74 61 69 6e 73 20 74 68 65 20 74 68 69 |contains the thi| 000000c0 72 64 20 6f 66 66 69 63 69 61 6c 20 72 65 6c 65 |rd official rele| 000000d0 61 73 65 20 6f 66 20 74 68 65 20 49 6e 64 65 70 |ase of the Indep| 000000e0 65 6e 64 65 6e 74 20 4a 50 45 47 0a 47 72 6f 75 |endent JPEG.Grou| 000000f0 70 27 73 20 66 72 65 65 20 4a 50 45 47 20 73 6f |p's free JPEG so| 00000100 66 74 77 61 72 65 2e 20 20 59 6f 75 20 61 72 65 |ftware. You are| 00000110 20 77 65 6c 63 6f 6d 65 20 74 6f 20 72 65 64 69 | welcome to redi| 00000120 73 74 72 69 62 75 74 65 20 74 68 69 73 20 73 6f |stribute this so| 00000130 66 74 77 61 72 65 20 61 6e 64 0a 74 6f 20 75 73 |ftware and.to us| 00000140 65 20 69 74 20 66 6f 72 20 61 6e 79 20 70 75 72 |e it for any pur| 00000150 70 6f 73 65 2c 20 73 75 62 6a 65 63 74 20 74 6f |pose, subject to| 00000160 20 74 68 65 20 63 6f 6e 64 69 74 69 6f 6e 73 20 | the conditions | 00000170 75 6e 64 65 72 20 4c 45 47 41 4c 20 49 53 53 55 |under LEGAL ISSU| 00000180 45 53 2c 20 62 65 6c 6f 77 2e 0a 0a 46 6f 72 20 |ES, below...For | 00000190 75 73 61 67 65 20 69 6e 73 74 72 75 63 74 69 6f |usage instructio| 000001a0 6e 73 2c 20 73 65 65 20 73 65 63 74 69 6f 6e 20 |ns, see section | 000001b0 55 53 41 47 45 2e 0a 0a 54 68 69 73 20 73 6f 66 |USAGE...This sof| 000001c0 74 77 61 72 65 20 69 73 20 73 74 69 6c 6c 20 75 |tware is still u| 000001d0 6e 64 65 72 67 6f 69 6e 67 20 72 65 76 69 73 69 |ndergoing revisi| 000001e0 6f 6e 2e 20 20 55 70 64 61 74 65 64 20 76 65 72 |on. Updated ver| 000001f0 73 69 6f 6e 73 20 6d 61 79 20 62 65 20 6f 62 74 |sions may be obt| 00000200 61 69 6e 65 64 0a 62 79 20 46 54 50 20 6f 72 20 |ained.by FTP or | 00000210 55 55 43 50 20 74 6f 20 55 55 4e 45 54 20 61 6e |UUCP to UUNET an| 00000220 64 20 6f 74 68 65 72 20 61 72 63 68 69 76 65 20 |d other archive | 00000230 73 69 74 65 73 3b 20 73 65 65 20 41 52 43 48 49 |sites; see ARCHI| 00000240 56 45 20 4c 4f 43 41 54 49 4f 4e 53 20 62 65 6c |VE LOCATIONS bel| 00000250 6f 77 0a 66 6f 72 20 64 65 74 61 69 6c 73 2e 0a |ow.for details..| 00000260 0a 49 66 20 79 6f 75 20 69 6e 74 65 6e 64 20 74 |.If you intend t| 00000270 6f 20 62 65 63 6f 6d 65 20 61 20 73 65 72 69 6f |o become a serio| 00000280 75 73 20 75 73 65 72 20 6f 66 20 74 68 69 73 20 |us user of this | 00000290 73 6f 66 74 77 61 72 65 2c 20 70 6c 65 61 73 65 |software, please| 000002a0 20 63 6f 6e 74 61 63 74 0a 6a 70 65 67 2d 69 6e | contact.jpeg-in| 000002b0 66 6f 40 75 75 6e 65 74 2e 75 75 2e 6e 65 74 20 |fo@uunet.uu.net | 000002c0 74 6f 20 62 65 20 61 64 64 65 64 20 74 6f 20 6f |to be added to o| 000002d0 75 72 20 65 6c 65 63 74 72 6f 6e 69 63 20 6d 61 |ur electronic ma| 000002e0 69 6c 69 6e 67 20 6c 69 73 74 2e 20 20 54 68 65 |iling list. The| 000002f0 6e 0a 79 6f 75 27 6c 6c 20 62 65 20 6e 6f 74 69 |n.you'll be noti| 00000300 66 69 65 64 20 6f 66 20 75 70 64 61 74 65 73 20 |fied of updates | 00000310 61 6e 64 20 68 61 76 65 20 61 20 63 68 61 6e 63 |and have a chanc| 00000320 65 20 74 6f 20 70 61 72 74 69 63 69 70 61 74 65 |e to participate| 00000330 20 69 6e 20 64 69 73 63 75 73 73 69 6f 6e 73 2c | in discussions,| 00000340 0a 65 74 63 2e 0a 0a 54 68 69 73 20 73 6f 66 74 |.etc...This soft| 00000350 77 61 72 65 20 69 73 20 74 68 65 20 77 6f 72 6b |ware is the work| 00000360 20 6f 66 20 54 6f 6d 20 4c 61 6e 65 2c 20 50 68 | of Tom Lane, Ph| 00000370 69 6c 69 70 20 47 6c 61 64 73 74 6f 6e 65 2c 20 |ilip Gladstone, | 00000380 4c 75 69 73 20 4f 72 74 69 7a 2c 0a 4c 65 65 20 |Luis Ortiz,.Lee | 00000390 43 72 6f 63 6b 65 72 2c 20 47 65 27 20 57 65 69 |Crocker, Ge' Wei| 000003a0 6a 65 72 73 2c 20 61 6e 64 20 6f 74 68 65 72 20 |jers, and other | 000003b0 6d 65 6d 62 65 72 73 20 6f 66 20 74 68 65 20 49 |members of the I| 000003c0 6e 64 65 70 65 6e 64 65 6e 74 20 4a 50 45 47 20 |ndependent JPEG | 000003d0 47 72 6f 75 70 2e 0a 0a 0a 44 49 53 43 4c 41 49 |Group....DISCLAI| 000003e0 4d 45 52 0a 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 0a 0a |MER.==========..| 000003f0 54 48 49 53 20 53 4f 46 54 57 41 52 45 20 49 53 |THIS SOFTWARE IS| 00000400 20 4e 4f 54 20 43 4f 4d 50 4c 45 54 45 20 4e 4f | NOT COMPLETE NO| 00000410 52 20 46 55 4c 4c 59 20 44 45 42 55 47 47 45 44 |R FULLY DEBUGGED| 00000420 2e 20 20 49 74 20 69 73 20 6e 6f 74 20 67 75 61 |. It is not gua| 00000430 72 61 6e 74 65 65 64 20 74 6f 20 62 65 0a 75 73 |ranteed to be.us| 00000440 65 66 75 6c 20 66 6f 72 20 61 6e 79 74 68 69 6e |eful for anythin| 00000450 67 2c 20 6e 6f 72 20 74 6f 20 62 65 20 63 6f 6d |g, nor to be com| 00000460 70 61 74 69 62 6c 65 20 77 69 74 68 20 73 75 62 |patible with sub| 00000470 73 65 71 75 65 6e 74 20 72 65 6c 65 61 73 65 73 |sequent releases| 00000480 2c 20 6e 6f 72 20 74 6f 20 62 65 0a 61 6e 20 61 |, nor to be.an a| 00000490 63 63 75 72 61 74 65 20 69 6d 70 6c 65 6d 65 6e |ccurate implemen| 000004a0 74 61 74 69 6f 6e 20 6f 66 20 74 68 65 20 4a 50 |tation of the JP| 000004b0 45 47 20 73 74 61 6e 64 61 72 64 2e 20 20 28 53 |EG standard. (S| 000004c0 65 65 20 4c 45 47 41 4c 20 49 53 53 55 45 53 20 |ee LEGAL ISSUES | 000004d0 66 6f 72 20 65 76 65 6e 0a 6d 6f 72 65 20 64 69 |for even.more di| 000004e0 73 63 6c 61 69 6d 65 72 73 2e 29 0a 0a 50 6c 65 |sclaimers.)..Ple| 000004f0 61 73 65 20 72 65 70 6f 72 74 20 61 6e 79 20 70 |ase report any p| 00000500 72 6f 62 6c 65 6d 73 20 77 69 74 68 20 74 68 69 |roblems with thi| 00000510 73 20 73 6f 66 74 77 61 72 65 20 74 6f 20 6a 70 |s software to jp| 00000520 65 67 2d 69 6e 66 6f 40 75 75 6e 65 74 2e 75 75 |eg-info@uunet.uu| 00000530 2e 6e 65 74 2e 0a 0a 0a 57 48 41 54 27 53 20 48 |.net....WHAT'S H| 00000540 45 52 45 0a 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 0a |ERE.===========.| 00000550 0a 54 68 69 73 20 64 69 73 74 72 69 62 75 74 69 |.This distributi| 00000560 6f 6e 20 63 6f 6e 74 61 69 6e 73 20 63 6f 6d 70 |on contains comp| 00000570 69 6c 65 64 20 43 20 73 6f 66 74 77 61 72 65 20 |iled C software | 00000580 74 6f 20 69 6d 70 6c 65 6d 65 6e 74 20 4a 50 45 |to implement JPE| 00000590 47 20 69 6d 61 67 65 0a 63 6f 6d 70 72 65 73 73 |G image.compress| 000005a0 69 6f 6e 20 61 6e 64 20 64 65 63 6f 6d 70 72 65 |ion and decompre| 000005b0 73 73 69 6f 6e 2e 20 20 4a 50 45 47 20 28 70 72 |ssion. 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