[轉]:官網:http://www.ijg.org

Independent JPEG Group

IJG is an informal group that writes and distributes a widely used free library for JPEG image compression

The latest release is version 6b of 27-Mar-1998. This is a stable and solid foundation for many application's JPEG support. 

You can find our code and some supporting documentation at http://www.ijg.org/files/, or by FTP at ftp://ftp.uu.net/graphics/jpeg/. If you can't cope with tar.gz-format archives, you may prefer the zip-format release at ftp://ftp.simtel.net/pub/simtelnet/msdos/graphics/jpegsr6.zip.

To learn more about how to use JPEG, see the JPEG FAQ. If you'd like to learn about how JPEG works, start with the comp.compression FAQ.

The ISO JPEG standards committee has their own web site. IJG is not affiliated with the ISO committee.

IJG development continues. Advanced features are being prepared for coming releases... 


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Independent JPEG Group's free JPEG oftware
-------------------------------------------

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, GIF, BMP, and Targa file formats.  The
core compression and decompression library 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.gz contains source code, documentation, and test files for
release N.

jpegaltui.vN.tar.gz contains source code for an alternate user interface for
cjpeg/djpeg.

wallace.ps.gz 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.gz tells where to obtain the JPEG standard and documents
about JPEG-related file formats.

jfif.ps.gz is a PostScript file of the JFIF (JPEG File Interchange Format)
format specification.

jfif.txt.gz is a plain text transcription of the JFIF specification; it's
missing a figure, so use the PostScript version if you can.

TIFFTechNote2.txt.gz is a draft of the proposed revisions to TIFF 6.0's
JPEG support.

pm.errata.gz is the errata list for the first printing of the textbook
"JPEG Still Image Data Compression Standard" by Pennebaker and Mitchell.

jdosaobj.zip contains pre-assembled object files for JMEMDOSA.ASM.
If you want to compile the IJG code for MS-DOS, but don't have an assembler,
these files may be helpful.


All files are compressed with gzip (GNU zip), except jdosaobj.zip which is
compressed with Info-Zip's zip (compatible with PKUNZIP).  If you don't
have gzip, uunet's FTP server can decompress the files for you on-the-fly.
Just fetch the given file name minus ".gz".

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