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You can also obtain this software in DOS-compatible "zip" archive format from 

the SimTel archives (ftp://ftp.simtel.net/pub/simtelnet/msdos/graphics/), or 

on CompuServe in the Graphics Support forum (GO CIS:GRAPHSUP), library 12 

"JPEG Tools".  Again, these versions may sometimes lag behind the ftp.uu.net 

release. 

 

The JPEG FAQ (Frequently Asked Questions) article is a useful source of 

general information about JPEG.  It is updated constantly and therefore is 

not included in this distribution.  The FAQ is posted every two weeks to 

Usenet newsgroups comp.graphics.misc, news.answers, and other groups. 

It is available on the World Wide Web at http://www.faqs.org/faqs/jpeg-faq/ 

and other news.answers archive sites, including the official news.answers 

archive at rtfm.mit.edu: ftp://rtfm.mit.edu/pub/usenet/news.answers/jpeg-

faq/. 

If you don't have Web or FTP access, send e-mail to mail-server@rtfm.mit.edu 

with body 

 

send usenet/news.answers/jpeg-faq/part1 

 

send usenet/news.answers/jpeg-faq/part2 

 

 

RELATED SOFTWARE 

================ 

 

Numerous viewing and image manipulation programs now support JPEG.  (Quite a 

few of them use this library to do so.)  The JPEG FAQ described above lists 

some of the more popular free and shareware viewers, and tells where to 

obtain them on Internet. 

 

If you are on a Unix machine, we highly recommend Jef Poskanzer's free 

PBMPLUS software, which provides many useful operations on PPM-format image 

files.  In particular, it can convert PPM images to and from a wide range of 

other formats, thus making cjpeg/djpeg considerably more useful.  The latest 

version is distributed by the NetPBM group, and is available from numerous 

sites, notably ftp://wuarchive.wustl.edu/graphics/graphics/packages/NetPBM/. 

Unfortunately PBMPLUS/NETPBM is not nearly as portable as the IJG software 

is; 

you are likely to have difficulty making it work on any non-Unix machine. 

 

A different free JPEG implementation, written by the PVRG group at Stanford, 

is available from ftp://havefun.stanford.edu/pub/jpeg/.  This program 

is designed for research and experimentation rather than production use; 

it is slower, harder to use, and less portable than the IJG code, but it 

is easier to read and modify.  Also, the PVRG code supports lossless JPEG, 

which we do not.  (On the other hand, it doesn't do progressive JPEG.) 

 

 

FILE FORMAT WARS 

================ 

 

Some JPEG programs produce files that are not compatible with our library. 

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.)