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1 The Independent JPEG Group's JPEG software
7 This distribution contains the sixth public release of the Independent JPEG
8 Group's free JPEG software. You are welcome to redistribute this software and
18 Guido Vollbeding, Ge' Weijers, and other members of the Independent JPEG
21 IJG is not affiliated with the official ISO JPEG standards committee.
29 OVERVIEW General description of JPEG and the IJG software.
31 REFERENCES Where to learn more about JPEG.
44 wizard.doc Advanced usage instructions for JPEG wizards only.
47 libjpeg.doc How to use the JPEG library in your own programs.
48 example.c Sample code for calling the JPEG library.
49 structure.doc Overview of the JPEG library's internal structure.
54 can also be found in the JPEG FAQ (Frequently Asked Questions) article. See
57 If you want to understand how the JPEG code works, we suggest reading one or
65 This package contains C software to implement JPEG image compression and
66 decompression. JPEG (pronounced "jay-peg") is a standardized compression
67 method for full-color and gray-scale images. JPEG is intended for compressing
69 are not its strong suit. JPEG is lossy, meaning that the output image is not
70 exactly identical to the input image. Hence you must not use JPEG if you
77 This software implements JPEG baseline, extended-sequential, and progressive
81 variants of JPEG; see LEGAL ISSUES. We have made no provision for supporting
84 We provide a set of library routines for reading and writing JPEG image files,
86 perform conversion between JPEG and some other popular image file formats.
90 considerable functionality beyond the bare JPEG coding/decoding capability;
91 for example, the color quantization modules are not strictly part of JPEG
95 "jpegtran", a utility for lossless transcoding between different JPEG
101 the software is not intended to be read as a tutorial on JPEG. (See the
142 the Independent JPEG Group".
153 it. This software may be referred to only as "the Independent JPEG Group's
176 It appears that the arithmetic coding option of the JPEG spec is covered by
179 support for arithmetic coding has been removed from the free JPEG software.
202 understand the innards of the JPEG software.
204 The best short technical introduction to the JPEG compression algorithm is
205 Wallace, Gregory K. "The JPEG Still Picture Compression Standard",
208 applications of JPEG, and related topics.) If you don't have the CACM issue
216 A somewhat less technical, more leisurely introduction to JPEG can be found in
220 including JPEG. It is an excellent source if you are comfortable reading C
221 code but don't know much about data compression in general. The book's JPEG
225 The best full description of JPEG is the textbook "JPEG Still Image Data
228 The book includes the complete text of the ISO JPEG standards (DIS 10918-1
229 and draft DIS 10918-2). This is by far the most complete exposition of JPEG
232 The JPEG standard itself is not available electronically; you must order a
248 Some extensions to the original JPEG standard are defined in JPEG Part 3,
252 The JPEG standard does not specify all details of an interchangeable file
266 ftp://ftp.sgi.com/graphics/tiff/TIFF6.ps.gz. The JPEG incorporation scheme
269 Instead, we recommend the JPEG design proposed by TIFF Technical Note #2
272 of the TIFF spec will replace the 6.0 JPEG design with the Note's design.
273 Although IJG's own code does not support TIFF/JPEG, the free libtiff library
274 uses our library to implement TIFF/JPEG per the Note. libtiff is available
294 "JPEG Tools". Again, these versions may sometimes lag behind the ftp.uu.net
297 The JPEG FAQ (Frequently Asked Questions) article is a useful source of
298 general information about JPEG. It is updated constantly and therefore is
313 Numerous viewing and image manipulation programs now support JPEG. (Quite a
314 few of them use this library to do so.) The JPEG FAQ described above lists
327 A different free JPEG implementation, written by the PVRG group at Stanford,
331 is easier to read and modify. Also, the PVRG code supports lossless JPEG,
332 which we do not. (On the other hand, it doesn't do progressive JPEG.)
338 Some JPEG programs produce files that are not compatible with our library.
339 The root of the problem is that the ISO JPEG committee failed to specify a
342 of the early commercial JPEG implementations for the Macintosh were able to
346 has been agreed to by a number of major commercial JPEG vendors, and it has
348 We recommend the use of TIFF/JPEG (TIFF revision 6.0 as modified by TIFF
350 additional data about an image. TIFF/JPEG is fairly new and not yet widely
353 The upcoming JPEG Part 3 standard defines a file format called SPIFF.
363 Various proprietary file formats incorporating JPEG compression also exist.
366 force convergence on common, open format standards for JPEG files. Don't
379 In future versions, we are considering supporting some of the upcoming JPEG