Cisco Cisco IPICS Dispatch Console Licensing Information

resulting GIF files are larger than usual, but are readable by all standard

GIF decoders.

 

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."

 

 

REFERENCES

==========

 

We highly recommend reading one or more of these references before trying to

understand the innards of the JPEG software.

 

The best short technical introduction to the JPEG compression algorithm is

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.)  If you don't have the CACM issue

handy, a PostScript file containing a revised version of Wallace's article is

available at ftp://ftp.uu.net/graphics/jpeg/wallace.ps.gz.  The file (actually

a preprint for an article that appeared 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.

 

A somewhat less technical, more leisurely introduction to JPEG can be found in

"The Data Compression Book" by Mark Nelson and Jean-loup Gailly, published by

M&T Books (New York), 2nd ed. 1996, ISBN 1-55851-434-1.  This book provides

good explanations and example C code for a multitude of compression methods

including JPEG.  It is an excellent source if you are comfortable reading C

code but don't know much about data compression in general.  The book's JPEG

sample code is far from industrial-strength, but when you are ready to look

at a full implementation, you've got one here...

 

The best full description of JPEG is the textbook "JPEG Still Image Data

Compression Standard" by William B. Pennebaker and Joan L. Mitchell, published

by Van Nostrand Reinhold, 1993, ISBN 0-442-01272-1.  Price US$59.95, 638 pp.

The book includes the complete text of the ISO JPEG standards (DIS 10918-1

and draft DIS 10918-2).  This is by far the most complete exposition of JPEG

in existence, and we highly recommend it.

 

The JPEG standard itself is not available electronically; you must order a

paper copy through ISO or ITU.  (Unless you feel a need to own a certified

official copy, we recommend buying the Pennebaker and Mitchell book instead;

it's much cheaper and includes a great deal of useful explanatory material.)

In the USA, copies of the standard may be ordered from ANSI Sales at (212)