From 6be16adbb103ef60a254184135ada3a0054601d2 Mon Sep 17 00:00:00 2001 From: Christophe Geuzaine <cgeuzaine@ulg.ac.be> Date: Sat, 18 May 2002 08:01:39 +0000 Subject: [PATCH] Add missing licenses --- Mesh/3D_Mesh.h | 16 ++ Mesh/SMS.cpp | 18 +++ Mesh/STL.cpp | 18 ++- Mesh/STL.h | 16 ++ Mesh/Smoothing.cpp | 18 ++- Mesh/SwapEdge.cpp | 18 ++- Mesh/SwapPatterns.h | 16 ++ Mesh/Utils.cpp | 18 ++- Mesh/Utils.h | 16 ++ jpeg/README | 349 ++++++++++++++++++++++++++++++++++++++++++++ 10 files changed, 499 insertions(+), 4 deletions(-) create mode 100644 jpeg/README diff --git a/Mesh/3D_Mesh.h b/Mesh/3D_Mesh.h index 2b0d87bd67..fc798425c7 100644 --- a/Mesh/3D_Mesh.h +++ b/Mesh/3D_Mesh.h @@ -1,6 +1,22 @@ #ifndef _3D_MESH_H_ #define _3D_MESH_H_ +// Copyright (C) 1997 - 2002 C. Geuzaine, J.-F. Remacle +// +// This program is free software; you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation; either version 2 of the License, or +// (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software +// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + Brick LaBrique (Grid_T * pGrid, double X, double Y, double Z); void AddSimplexInGrid (Mesh * m, Simplex * s, int boule_boite); int Coherence (Volume * v, Mesh * m); diff --git a/Mesh/SMS.cpp b/Mesh/SMS.cpp index c6019af62d..a021ec0553 100644 --- a/Mesh/SMS.cpp +++ b/Mesh/SMS.cpp @@ -1,3 +1,21 @@ +// $Id: SMS.cpp,v 1.7 2002-05-18 08:01:39 geuzaine Exp $ +// +// Copyright (C) 1997 - 2002 C. Geuzaine, J.-F. Remacle +// +// This program is free software; you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation; either version 2 of the License, or +// (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software +// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + #include <iostream.h> #include <assert.h> #include "Gmsh.h" diff --git a/Mesh/STL.cpp b/Mesh/STL.cpp index 80870de30b..3df21fe31c 100644 --- a/Mesh/STL.cpp +++ b/Mesh/STL.cpp @@ -1,4 +1,20 @@ -// $Id: STL.cpp,v 1.5 2001-04-26 17:58:00 remacle Exp $ +// $Id: STL.cpp,v 1.6 2002-05-18 08:01:39 geuzaine Exp $ +// +// Copyright (C) 1997 - 2002 C. Geuzaine, J.-F. Remacle +// +// This program is free software; you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation; either version 2 of the License, or +// (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software +// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. #include "Gmsh.h" #include "Mesh.h" diff --git a/Mesh/STL.h b/Mesh/STL.h index a4b394f336..fd54e89fd8 100644 --- a/Mesh/STL.h +++ b/Mesh/STL.h @@ -1,6 +1,22 @@ #ifndef _STL_H_ #define _STL_H_ +// Copyright (C) 1997 - 2002 C. Geuzaine, J.-F. Remacle +// +// This program is free software; you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation; either version 2 of the License, or +// (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software +// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + class STL_Data { public: diff --git a/Mesh/Smoothing.cpp b/Mesh/Smoothing.cpp index 003331721e..dfce38f600 100644 --- a/Mesh/Smoothing.cpp +++ b/Mesh/Smoothing.cpp @@ -1,4 +1,20 @@ -// $Id: Smoothing.cpp,v 1.6 2001-08-11 23:28:32 geuzaine Exp $ +// $Id: Smoothing.cpp,v 1.7 2002-05-18 08:01:39 geuzaine Exp $ +// +// Copyright (C) 1997 - 2002 C. Geuzaine, J.-F. Remacle +// +// This program is free software; you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation; either version 2 of the License, or +// (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software +// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. #include "Gmsh.h" #include "Numeric.h" diff --git a/Mesh/SwapEdge.cpp b/Mesh/SwapEdge.cpp index 5e11fd1ba5..8028e31ed2 100644 --- a/Mesh/SwapEdge.cpp +++ b/Mesh/SwapEdge.cpp @@ -1,4 +1,20 @@ -// $Id: SwapEdge.cpp,v 1.8 2002-05-18 07:18:03 geuzaine Exp $ +// $Id: SwapEdge.cpp,v 1.9 2002-05-18 08:01:39 geuzaine Exp $ +// +// Copyright (C) 1997 - 2002 C. Geuzaine, J.-F. Remacle +// +// This program is free software; you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation; either version 2 of the License, or +// (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software +// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. #include "Gmsh.h" #include "Numeric.h" diff --git a/Mesh/SwapPatterns.h b/Mesh/SwapPatterns.h index db379bdf2b..12a9a579ec 100644 --- a/Mesh/SwapPatterns.h +++ b/Mesh/SwapPatterns.h @@ -1,6 +1,22 @@ #ifndef _SWAP_PATTERNS_H_ #define _SWAP_PATTERNS_H_ +// Copyright (C) 1997 - 2002 C. Geuzaine, J.-F. Remacle +// +// This program is free software; you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation; either version 2 of the License, or +// (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software +// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + int swap_patterns_3 [1][1][3] = { { {0,1,2} diff --git a/Mesh/Utils.cpp b/Mesh/Utils.cpp index 523e2ecff1..99fbf3d8a2 100644 --- a/Mesh/Utils.cpp +++ b/Mesh/Utils.cpp @@ -1,4 +1,20 @@ -// $Id: Utils.cpp,v 1.10 2002-02-16 14:14:47 remacle Exp $ +// $Id: Utils.cpp,v 1.11 2002-05-18 08:01:39 geuzaine Exp $ +// +// Copyright (C) 1997 - 2002 C. Geuzaine, J.-F. Remacle +// +// This program is free software; you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation; either version 2 of the License, or +// (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software +// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. #include "Gmsh.h" #include "Numeric.h" diff --git a/Mesh/Utils.h b/Mesh/Utils.h index 0b71f07145..26bd1a0e0e 100644 --- a/Mesh/Utils.h +++ b/Mesh/Utils.h @@ -1,6 +1,22 @@ #ifndef _UTILS_H_ #define _UTILS_H_ +// Copyright (C) 1997 - 2002 C. Geuzaine, J.-F. Remacle +// +// This program is free software; you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation; either version 2 of the License, or +// (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software +// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + void direction (Vertex * v1, Vertex * v2, double d[3]); void Projette (Vertex * v, double mat[3][3]); void MeanPlane(List_T *point, Surface *s); diff --git a/jpeg/README b/jpeg/README new file mode 100644 index 0000000000..c882ffb759 --- /dev/null +++ b/jpeg/README @@ -0,0 +1,349 @@ +The Independent JPEG Group's JPEG software +========================================== + +README for release 5 of 24-Sep-94 +================================= + +This distribution contains the fifth public release of the Independent JPEG +Group's free JPEG software. You are welcome to redistribute this software and +to use it for any purpose, subject to the conditions under LEGAL ISSUES, below. + +Serious users of this software (particularly those incorporating it into +larger programs) should contact jpeg-info@uunet.uu.net to be added to our +electronic mailing list. Mailing list members are notified of updates and +have a chance to participate in technical discussions, etc. + +This software is the work of Tom Lane, Philip Gladstone, Luis Ortiz, Jim +Boucher, Lee Crocker, George Phillips, Davide Rossi, Ge' Weijers, and other +members of the Independent JPEG Group. + +IJG is not associated with the official ISO JPEG standards committee. + + +DOCUMENTATION ROADMAP +===================== + +This file contains the following sections: + +OVERVIEW General description of JPEG and the IJG software. +LEGAL ISSUES Copyright, lack of warranty, terms of distribution. +REFERENCES Where to learn more about JPEG. +ARCHIVE LOCATIONS Where to find newer versions of this software. +RELATED SOFTWARE Other stuff you should get. +FILE FORMAT WARS Software *not* to get. +TO DO Plans for future IJG releases. + +Other documentation files in the distribution are: + +User documentation: + install.doc How to configure and install the IJG software. + usage.doc Usage instructions for cjpeg, djpeg, rdjpgcom, wrjpgcom. + *.1 Unix-style man pages for programs (same info as usage.doc). + change.log Version-to-version change highlights. +Programmer and internal documentation: + libjpeg.doc How to use the JPEG library in your own programs. + example.c Sample code for calling the JPEG library. + structure.doc Overview of the JPEG library's internal structure. + filelist.doc Road map of IJG files. + coderules.doc Coding style rules --- please read if you contribute code. + +Please read at least the files install.doc and usage.doc. Useful information +can also be found in the JPEG FAQ (Frequently Asked Questions) article. See +ARCHIVE LOCATIONS below to find out where to obtain the FAQ article. + +If you want to understand how the JPEG code works, we suggest reading one or +more of the REFERENCES, then looking at the documentation files (in roughly +the order listed) before diving into the code. + + +OVERVIEW +======== + +This package contains C software to implement JPEG image compression and +decompression. JPEG (pronounced "jay-peg") is a standardized compression +method for full-color and gray-scale images. JPEG is intended for compressing +"real-world" scenes; cartoons and other non-realistic images are not its +strong suit. JPEG is lossy, meaning that the output image is not necessarily +identical to the input image. Hence you must not use JPEG if you have to have +identical output bits. However, on typical images of real-world scenes, very +good compression levels can be obtained with no visible change, and amazingly +high compression levels are possible if you can tolerate a low-quality image. +For more details, see the references, or just experiment with various +compression settings. + +We provide a set of library routines for reading and writing JPEG image files, +plus two simple applications "cjpeg" and "djpeg", which use the library to +perform conversion between JPEG and some other popular image file formats. +The library is intended to be reused in other applications. + +This software implements JPEG baseline and extended-sequential compression +processes. Provision is made for supporting all variants of these processes, +although some uncommon parameter settings aren't implemented yet. For legal +reasons, we are not distributing code for the arithmetic-coding process; see +LEGAL ISSUES. At present we have made no provision for supporting the +progressive, hierarchical, or lossless processes defined in the standard. +(Support for progressive mode may be offered in a future release.) + +In order to support file conversion and viewing software, we have included +considerable functionality beyond the bare JPEG coding/decoding capability; +for example, the color quantization modules are not strictly part of JPEG +decoding, but they are essential for output to colormapped file formats or +colormapped displays. These extra functions can be compiled out of the +library if not required for a particular application. We have also included +two simple applications for inserting and extracting textual comments in +JFIF files. + +The emphasis in designing this software has been on achieving portability and +flexibility, while also making it fast enough to be useful. In particular, +the software is not intended to be read as a tutorial on JPEG. (See the +REFERENCES section for introductory material.) While we hope that the entire +package will someday be industrial-strength code, much remains to be done in +performance tuning and in improving the capabilities of individual modules. + +We welcome the use of this software as a component of commercial products. +No royalty is required, but we do ask for an acknowledgement in product +documentation, as described under LEGAL ISSUES. + + +LEGAL ISSUES +============ + +In plain English: + +1. We don't promise that this software works. (But if you find any bugs, + please let us know!) +2. You can use this software for whatever you want. You don't have to pay us. +3. You may not pretend that you wrote this software. If you use it in a + program, you must acknowledge somewhere in your documentation that + you've used the IJG code. + +In legalese: + +The authors make NO WARRANTY or representation, either express or implied, +with respect to this software, its quality, accuracy, merchantability, or +fitness for a particular purpose. This software is provided "AS IS", and you, +its user, assume the entire risk as to its quality and accuracy. + +This software is copyright (C) 1991, 1992, 1993, 1994, Thomas G. Lane. +All Rights Reserved except as specified below. + +Permission is hereby granted to use, copy, modify, and distribute this +software (or portions thereof) for any purpose, without fee, subject to these +conditions: +(1) If any part of the source code for this software is distributed, then this +README file must be included, with this copyright and no-warranty notice +unaltered; and any additions, deletions, or changes to the original files +must be clearly indicated in accompanying documentation. +(2) If only executable code is distributed, then the accompanying +documentation must state that "this software is based in part on the work of +the Independent JPEG Group". +(3) Permission for use of this software is granted only if the user accepts +full responsibility for any undesirable consequences; the authors accept +NO LIABILITY for damages of any kind. + +These conditions apply to any software derived from or based on the IJG code, +not just to the unmodified library. If you use our work, you ought to +acknowledge us. + +Permission is NOT granted for the use of any IJG author's name or company name +in advertising or publicity relating to this software or products derived from +it. This software may be referred to only as "the Independent JPEG Group's +software". + +We specifically permit and encourage the use of this software as the basis of +commercial products, provided that all warranty or liability claims are +assumed by the product vendor. + + +ansi2knr.c is included in this distribution by permission of L. Peter Deutsch, +sole proprietor of its copyright holder, Aladdin Enterprises of Menlo Park, CA. +ansi2knr.c is NOT covered by the above copyright and conditions, but instead +by the usual distribution terms of the Free Software Foundation; principally, +that you must include source code if you redistribute it. (See the file +ansi2knr.c for full details.) However, since ansi2knr.c is not needed as part +of any program generated from the IJG code, this does not limit you more than +the foregoing paragraphs do. + +The configuration script "configure" was produced by GNU Autoconf. Again, +the FSF copyright terms apply only to configure, not to the IJG code; and +again, that does not limit your use of the object code. + +It appears that the arithmetic coding option of the JPEG spec is covered by +patents owned by IBM, AT&T, and Mitsubishi. Hence arithmetic coding cannot +legally be used without obtaining one or more licenses. For this reason, +support for arithmetic coding has been removed from the free JPEG software. +(Since arithmetic coding provides only a marginal gain over the unpatented +Huffman mode, it is unlikely that very many implementations will support it.) +So far as we are aware, there are no patent restrictions on the remaining +code. + +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.uu.net, graphics/jpeg/wallace.ps.gz. The file (actually a +preprint for an article to appear 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, published by M&T Books (Redwood +City, CA), 1991, ISBN 1-55851-216-0. 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. (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 US, +copies of the standard may be ordered from ANSI Sales at (212) 642-4900, or +from Global Engineering Documents at (800) 854-7179. (ANSI doesn't take +credit card orders, but Global does.) It's not cheap: as of 1992, ANSI was +charging $95 for Part 1 and $47 for Part 2, plus 7% shipping/handling. The +standard is divided into two parts, Part 1 being the actual specification, +while Part 2 covers compliance testing methods. Part 1 is titled "Digital +Compression and Coding of Continuous-tone Still Images, Part 1: Requirements +and guidelines" and has document number ISO/IEC IS 10918-1. As of mid-1994, +Part 2 is still at Draft International Standard status. It is titled "Digital +Compression and Coding of Continuous-tone Still Images, Part 2: Compliance +testing" and has document number ISO/IEC DIS 10918-2. (The document number +will change to IS 10918-2 when final approval is obtained.) A Part 3, +covering extensions, is likely to appear in draft form in late 1994. + +The JPEG standard does not specify all details of an interchangeable file +format. For the omitted details we follow the "JFIF" conventions, revision +1.02. A copy of the JFIF spec is available from: + Literature Department + C-Cube Microsystems, Inc. + 1778 McCarthy Blvd. + Milpitas, CA 95035 + phone (408) 944-6300, fax (408) 944-6314 +A PostScript version of this document is available at ftp.uu.net, file +graphics/jpeg/jfif.ps.gz. It can also be obtained by e-mail from the C-Cube +mail server, netlib@c3.pla.ca.us. Send the message "send jfif_ps from jpeg" +to the server to obtain the JFIF document; send the message "help" if you have +trouble. + +The TIFF 6.0 file format specification can be obtained by FTP from sgi.com +(192.48.153.1), file graphics/tiff/TIFF6.ps.Z; or you can order a printed copy +from Aldus Corp. at (206) 628-6593. It should be noted that the TIFF 6.0 spec +of 3-June-92 has a number of serious problems in its JPEG features. A +redesign effort is currently underway to correct these problems; it is +expected to result in a new, incompatible, spec. IJG intends to support the +corrected version of TIFF when the new spec is issued. + + +ARCHIVE LOCATIONS +================= + +The "official" archive site for this software is ftp.uu.net (Internet +address 192.48.96.9). The most recent released version can always be found +there in directory graphics/jpeg. This particular version will be archived +as graphics/jpeg/jpegsrc.v5.tar.gz. If you are on the Internet, you +can retrieve files from ftp.uu.net by standard anonymous FTP. If you don't +have FTP access, UUNET's archives are also available via UUCP; contact +help@uunet.uu.net for information on retrieving files that way. + +Numerous Internet sites maintain copies of the UUNET files; in particular, +you can probably find a copy at any site that archives comp.sources.misc +submissions. However, only ftp.uu.net is guaranteed to have the latest +official version. + +You can also obtain this software from CompuServe, in the GRAPHSUPPORT forum +(GO GRAPHSUP); this version will be file jpsrc5.zip in library 15. Again, +CompuServe is not guaranteed to have the very latest version. + +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, news.answers, and other groups. You +can always obtain the latest version from the news.answers archive at +rtfm.mit.edu (18.181.0.24). By FTP, fetch /pub/usenet/news.answers/jpeg-faq. +If you don't have FTP, send e-mail to mail-server@rtfm.mit.edu with body +"send usenet/news.answers/jpeg-faq". + + +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 image 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. You can obtain this package by FTP from ftp.x.org +(contrib/pbmplus*.tar.Z) or ftp.ee.lbl.gov (pbmplus*.tar.Z). There is also +a newer update of this package called NETPBM, available from +wuarchive.wustl.edu under directory /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 havefun.stanford.edu in directory 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 +implements a larger subset of the JPEG standard. In particular, it supports +lossless 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.) + +The file format we have adopted is called JFIF (see REFERENCES). This format +has been agreed to by a number of major commercial JPEG vendors, and it has +become the de facto standard. JFIF is a minimal or "low end" representation. +Work is also going forward to incorporate JPEG compression into the TIFF +standard, for use in "high end" applications that need to record a lot of +additional data about an image. We intend to support TIFF in the future. +We hope that these two formats will be sufficient and that other, +incompatible JPEG file formats will not proliferate. + +Indeed, part of the reason for developing and releasing this free software is +to help force rapid convergence to de facto standards for JPEG file formats. +SUPPORT STANDARD, NON-PROPRIETARY FORMATS: demand JFIF or TIFF/JPEG! + + +TO DO +===== + +In future versions, we are considering supporting progressive JPEG +compression, the upcoming JPEG Part 3 extensions, and other improvements. + +As always, speeding things up is high on our priority list. + +Please send bug reports, offers of help, etc. to jpeg-info@uunet.uu.net. -- GitLab