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README
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1994-01-03
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Independent JPEG Group's free JPEG software
-------------------------------------------
This package contains C software to implement JPEG image compression and
decompression. JPEG 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 identical to the input image.
The user can trade off output image quality against compressed file size by
adjusting a compression parameter.
The distributed programs provide conversion between JPEG "JFIF" format and
image files in PBMPLUS PPM/PGM, Utah RLE, Truevision Targa, and GIF file
formats. The core compression and decompression modules can easily be
reused in other programs, such as image viewers. The package is highly
portable C code; we have tested it on many machines ranging from PCs to Crays.
We are releasing this software for both noncommercial and commercial use.
Companies are welcome to use it as the basis for JPEG-related products.
We do not ask a royalty, although we do ask for an acknowledgement in
product literature (see the README file in the distribution for details).
We hope to make this software industrial-quality --- although, as with
anything that's free, we offer no warranty and accept no liability.
For more information, contact jpeg-info@uunet.uu.net.
Contents of this directory
--------------------------
jpegsrc.vN.tar.Z contains source code, documentation, and test files for
release N.
wallace.ps.Z is a PostScript file of Greg Wallace's introductory article
about JPEG. This is an update of the article that appeared in the April
1991 Communications of the ACM.
jpeg.documents tells where to obtain the JPEG standard and documents
about JPEG-related file formats.
jfif.ps.Z is a PostScript file of the JFIF (JPEG File Interchange Format)
format specification.
jfif.txt.Z is a plain text transcription of the JFIF specification; it's
missing a figure, so use the PostScript version if you can.
pm.errata is the errata list for the first printing of the textbook
"JPEG Still Image Data Compression Standard" by Pennebaker and Mitchell.