Legal

 ** LibRaw: Raw images processing library **

Copyright (C) 2008-2025 LibRaw LLC (http://www.libraw.org, info@libraw.org)
 
LibRaw is free software; you can redistribute it and/or modify
it under the terms of the one of two licenses as you choose:

1. GNU LESSER GENERAL PUBLIC LICENSE version 2.1
   (See file LICENSE.LGPL provided in LibRaw distribution archive for details).

2. COMMON DEVELOPMENT AND DISTRIBUTION LICENSE (CDDL) Version 1.0
   (See file LICENSE.CDDL provided in LibRaw distribution archive for details).

LibRaw uses code from dcraw.c -- Dave Coffin's raw photo decoder,
dcraw.c is copyright 1997-2018 by Dave Coffin, dcoffin a cybercom o net.
LibRaw do not use RESTRICTED code from dcraw.c

LibRaw uses DCB demosaic and FBDD denoise licensed under BSD-like 3-clause license
DCB and FBDD are Copyright (C) 2010,  Jacek Gozdz (cuniek@kft.umcs.lublin.pl)

LibRaw uses X3F library to unpack Foveon Files, licensed BSD-style license
Copyright (c) 2010, Roland Karlsson (roland@proxel.se)
All rights reserved.

LibRaw uses pieces of code from Adobe DNG SDK 1.4,
Copyright (c) 2005 Adobe Systems Incorporated, licensed under MIT license

COMMON DEVELOPMENT AND DISTRIBUTION LICENSE (CDDL) Version 1.0

1. Definitions.

1.1. Contributor means each individual or entity that creates or
contributes to the creation of Modifications.

1.2. Contributor Version means the combination of the Original
Software, prior Modifications used by a Contributor (if any),
and the Modifications made by that particular Contributor.

1.3. Covered Software means (a) the Original Software, or (b)
Modifications, or (c) the combination of files containing
Original Software with files containing Modifications, in each
case including portions thereof.

1.4. Executable means the Covered Software in any form other
than Source Code.

1.5. Initial Developer means the individual or entity that first
makes Original Software available under this License.

1.6. Larger Workmeans a work which combines Covered Software or
portions thereof with code not governed by the terms of this
License.

1.7. License means this document.

1.8. Licensable means having the right to grant, to the maximum
extent possible, whether at the time of the initial grant or 
subsequently acquired, any and all of the rights conveyed herein.

1.9. Modifications means the Source Code and Executable form of
any of the following: A. Any file that results from an addition
to, deletion from or modification of the contents of a file
containing Original Software or previous Modifications; B. Any
new file that contains any part of the Original Software or
previous Modification; or C. Any new file that is contributed or
otherwise made available under the terms of this License.

1.10. Original Software means the Source Code and Executable
form of computer software code that is originally released under
this License.

1.11. Patent Claims means any patent claim(s), now owned or
hereafter acquired, including without limitation, method,
process, and apparatus claims, in any patent Licensable by
grantor.

1.12. Source Code means (a) the common form of computer software
code in which modifications are made and (b) associated
documentation included in or with such code.

1.13. You (or Your) means an individual or a legal entity
exercising rights under, and complying with all of the terms of,
this License. For legal entities, You includes any entity which
controls, is controlled by, or is under common control with You.
For purposes of this definition, control means (a) the power,
direct or indirect, to cause the direction or management of such
entity, whether by contract or otherwise, or (b) ownership of
more than fifty percent (50%) of the outstanding shares or
beneficial ownership of such entity.

2. License Grants.

2.1. The Initial Developer Grant. Conditioned upon Your
compliance with Section 3.1 below and subject to third party
intellectual property claims, the Initial Developer hereby
grants You a world-wide, royalty-free, non-exclusive license:

(a) under intellectual property rights (other than patent or
trademark) Licensable by Initial Developer, to use, reproduce,
modify, display, perform, sublicense and distribute the Original
Software (or portions thereof), with or without Modifications,
and/or as part of a Larger Work; and

(b) under Patent Claims infringed by the making, using or
selling of Original Software, to make, have made, use, practice,
sell, and offer for sale, and/or otherwise dispose of the
Original Software (or portions thereof);

(c) The licenses granted in Sections 2.1(a) and (b) are
effective on the date Initial Developer first distributes or
otherwise makes the Original Software available to a third party
under the terms of this License;

(d) Notwithstanding Section 2.1(b) above, no patent license is
granted: (1) for code that You delete from the Original
Software, or (2) for infringements caused by: (i) the
modification of the Original Software, or (ii) the combination
of the Original Software with other software or devices.

2.2. Contributor Grant. Conditioned upon Your compliance with
Section 3.1 below and subject to third party intellectual
property claims, each Contributor hereby grants You a
world-wide, royalty-free, non-exclusive license:

(a) under intellectual property rights (other than patent or
trademark) Licensable by Contributor to use, reproduce, modify,
display, perform, sublicense and distribute the Modifications
created by such Contributor (or portions thereof), either on an
unmodified basis, with other Modifications, as Covered Software
and/or as part of a Larger Work; and

(b) under Patent Claims infringed by the making, using, or
selling of Modifications made by that Contributor either alone
and/or in combination with its Contributor Version (or portions
of such combination), to make, use, sell, offer for sale, have
made, and/or otherwise dispose of: (1) Modifications made by
that Contributor (or portions thereof); and (2) the combination
of Modifications made by that Contributor with its Contributor
Version (or portions of such combination).

(c) The licenses granted in Sections 2.2(a) and 2.2(b)
areeffective on the date Contributor first distributes or
otherwise makes the Modifications available to a third party.

(d) Notwithstanding Section 2.2(b) above, no patent license is
granted: (1) for any code that Contributor has deleted from the
Contributor Version; (2) for infringements caused by: (i) third
party modifications of Contributor Version, or (ii) the
combination of Modifications made by that Contributor with other
software (except as part of the Contributor Version) or other
devices; or (3) under Patent Claims infringed by Covered
Software in the absence of Modifications made by that
Contributor.

3. Distribution Obligations.

3.1. Availability of Source Code. Any Covered Software that You
distribute or otherwise make available in Executable form must
also be made available in Source Code form and that Source Code
form must be distributed only under the terms of this License.
You must include a copy of this License with every copy of the
Source Code form of the Covered Software You distribute or
otherwise make available. You must inform recipients of any such
Covered Software in Executable form as to how they can obtain
such Covered Software in Source Code form in a reasonable manner
on or through a medium customarily used for software exchange.

3.2. Modifications. The Modifications that You create or to
which You contribute are governed by the terms of this License.
You represent that You believe Your Modifications are Your
original creation(s) and/or You have sufficient rights to grant
the rights conveyed by this License.

3.3. Required Notices. You must include a notice in each of Your
Modifications that identifies You as the Contributor of the
Modification. You may not remove or alter any copyright, patent
or trademark notices contained within the Covered Software, or
any notices of licensing or any descriptive text giving
attribution to any Contributor or the Initial Developer.

3.4. Application of Additional Terms. You may not offer or
impose any terms on any Covered Software in Source Code form
that alters or restricts the applicable version of this License
or the recipients rights hereunder. You may choose to offer, and
to charge a fee for, warranty, support, indemnity or liability
obligations to one or more recipients of Covered
Software. However, you may do so only on Your own behalf, and
not on behalf of the Initial Developer or any Contributor. You
must make it absolutely clear that any such warranty, support,
indemnity or liability obligation is offered by You alone, and
You hereby agree to indemnify the Initial Developer and every
Contributor for any liability incurred by the Initial Developer
or such Contributor as a result of warranty, support, indemnity
or liability terms You offer.

3.5. Distribution of Executable Versions. You may distribute the
Executable form of the Covered Software under the terms of this
License or under the terms of a license of Your choice, which
may contain terms different from this License, provided that You
are in compliance with the terms of this License and that the
license for the Executable form does not attempt to limit or
alter the recipients rights in the Source Code form from the
rights set forth in this License. If You distribute the Covered
Software in Executable form under a different license, You must
make it absolutely clear that any terms which differ from this
License are offered by You alone, not by the Initial Developer
or Contributor. You hereby agree to indemnify the Initial
Developer and every Contributor for any liability incurred by
the Initial Developer or such Contributor as a result of any
such terms You offer.

3.6. Larger Works. You may create a Larger Work by combining
Covered Software with other code not governed by the terms of
this License and distribute the Larger Work as a single product.
In such a case, You must make sure the requirements of this
License are fulfilled for the Covered Software.

4. Versions of the License.

4.1. New Versions. Sun Microsystems, Inc. is the initial license
steward and may publish revised and/or new versions of this
License from time to time. Each version will be given a
distinguishing version number. Except as provided in Section
4.3, no one other than the license steward has the right to
modify this License.

4.2. Effect of New Versions. You may always continue to use,
distribute or otherwise make the Covered Software available
under the terms of the version of the License under which You
originally received the Covered Software. If the Initial
Developer includes a notice in the Original Software prohibiting
it from being distributed or otherwise made available under any
subsequent version of the License, You must distribute and make
the Covered Software available under the terms of the version of
the License under which You originally received the Covered
Software.  Otherwise, You may also choose to use, distribute or
otherwise make the Covered Software available under the terms of
any subsequent version of the License published by the license
steward.

4.3. Modified Versions. When You are an Initial Developer and
You want to create a new license for Your Original Software, You
may create and use a modified version of this License if You:
(a) rename the license and remove any references to the name of
the license steward (except to note that the license differs
from this License); and (b) otherwise make it clear that the
license contains terms which differ from this License.

5. DISCLAIMER OF WARRANTY. COVERED SOFTWARE IS PROVIDED UNDER
THIS LICENSE ON AN AS IS BASIS, WITHOUT WARRANTY OF ANY KIND,
EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION,
WARRANTIES THAT THE COVERED SOFTWARE IS FREE OF DEFECTS,
MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE OR NON-INFRINGING.
THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED
SOFTWARE IS WITH YOU. SHOULD ANY COVERED SOFTWARE PROVE
DEFECTIVE IN ANY RESPECT, YOU (NOT THE INITIAL DEVELOPER OR ANY
OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY SERVICING,
REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN
ESSENTIAL PART OF THIS LICENSE. NO USE OF ANY COVERED SOFTWARE
IS AUTHORIZED HEREUNDER EXCEPT UNDER THIS DISCLAIMER.

6. TERMINATION.

6.1. This License and the rights granted hereunder will
terminate automatically if You fail to comply with terms herein
and fail to cure such breach within 30 days of becoming aware of
the breach. Provisions which, by their nature, must remain in
effect beyond the termination of this License shall survive.

6.2. If You assert a patent infringement claim (excluding
declaratory judgment actions) against Initial Developer or a
Contributor (the Initial Developer or Contributor against whom
You assert such claim is referred to as Participant) alleging
that the Participant Software (meaning the Contributor Version
where the Participant is a Contributor or the Original Software
where the Participant is the Initial Developer) directly or
indirectly infringes any patent, then any and all rights granted
directly or indirectly to You by such Participant, the Initial
Developer (if the Initial Developer is not the Participant) and
all Contributors under Sections 2.1 and/or 2.2 of this License
shall, upon 60 days notice from Participant terminate
prospectively and automatically at the expiration of such 60 day
notice period, unless if within such 60 day period You withdraw
Your claim with respect to the Participant Software against such
Participant either unilaterally or pursuant to a written
agreement with Participant.

6.3. In the event of termination under Sections 6.1 or 6.2
above, all end user licenses that have been validly granted by
You or any distributor hereunder prior to termination (excluding
licenses granted to You by any distributor) shall survive
termination.

7. LIMITATION OF LIABILITY. UNDER NO CIRCUMSTANCES AND UNDER NO
LEGAL THEORY, WHETHER TORT (INCLUDING NEGLIGENCE), CONTRACT, OR
OTHERWISE, SHALL YOU, THE INITIAL DEVELOPER, ANY OTHER
CONTRIBUTOR, OR ANY DISTRIBUTOR OF COVERED SOFTWARE, OR ANY
SUPPLIER OF ANY OF SUCH PARTIES, BE LIABLE TO ANY PERSON FOR ANY
INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OF ANY
CHARACTER INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOST
PROFITS, LOSS OF GOODWILL, WORK STOPPAGE, COMPUTER FAILURE OR
MALFUNCTION, OR ANY AND ALL OTHER COMMERCIAL DAMAGES OR LOSSES,
EVEN IF SUCH PARTY SHALL HAVE BEEN INFORMED OF THE POSSIBILITY
OF SUCH DAMAGES. THIS LIMITATION OF LIABILITY SHALL NOT APPLY TO
LIABILITY FOR DEATH OR PERSONAL INJURY RESULTING FROM SUCH
PARTYS NEGLIGENCE TO THE EXTENT APPLICABLE LAW PROHIBITS SUCH
LIMITATION. SOME JURISDICTIONS DO NOT ALLOW THE EXCLUSION OR
LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THIS
EXCLUSION AND LIMITATION MAY NOT APPLY TO YOU.

8. U.S. GOVERNMENT END USERS. The Covered Software is a
commercial item, as that term is defined in 48 C.F.R. 2.101
(Oct. 1995), consisting of commercial computer software (as that
term is defined at 48 C.F.R. 252.227-7014(a)(1)) and commercial
computer software documentation as such terms are used in 48
C.F.R. 12.212 (Sept. 1995). Consistent with 48 C.F.R. 12.212 and
48 C.F.R. 227.7202-1 through 227.7202-4 (June 1995), all
U.S. Government End Users acquire Covered Software with only
those rights set forth herein. This U.S. Government Rights
clause is in lieu of, and supersedes, any other FAR, DFAR, or
other clause or provision that addresses Government rights in
computer software under this License.

9. MISCELLANEOUS. This License represents the complete agreement
concerning subject matter hereof. If any provision of this
License is held to be unenforceable, such provision shall be
reformed only to the extent necessary to make it enforceable.
This License shall be governed by the law of the jurisdiction
specified in a notice contained within the Original Software
(except to the extent applicable law, if any, provides
otherwise), excluding such jurisdictions conflict-of-law
provisions. Any litigation relating to this License shall be
subject to the jurisdiction of the courts located in the
jurisdiction and venue specified in a notice contained within
the Original Software, with the losing party responsible for
costs, including, without limitation, court costs and reasonable
attorneys fees and expenses. The application of the United
Nations Convention on Contracts for the International Sale of
Goods is expressly excluded. Any law or regulation which
provides that the language of a contract shall be construed
against the drafter shall not apply to this License. You agree
that You alone are responsible for compliance with the United
States export administration regulations (and the export control
laws and regulation of any other countries) when You use,
distribute or otherwise make available any Covered Software.

10. RESPONSIBILITY FOR CLAIMS. As between Initial Developer and
the Contributors, each party is responsible for claims and
damages arising, directly or indirectly, out of its utilization
of rights under this License and You agree to work with Initial
Developer and Contributors to distribute such responsibility on
an equitable basis. Nothing herein is intended or shall be
deemed to constitute any admission of liability.

----------------------------------------------------------------

NOTICE PURSUANT TO SECTION 9 OF THE COMMON DEVELOPMENT AND
DISTRIBUTION LICENSE (CDDL): This code is released under the
CDDL and shall be governed by the laws of the State of
California (excluding conflict-of-law provisions). Any
litigation relating to this License shall be subject to the
jurisdiction of the Federal Courts of the Northern District of
California and the state courts of the State of California, with
venue lying in Santa Clara County, California.

----------------------------------------------------------------

DCB demosaic and FBDD denoise code in LibRaw (src/demosaic/dcb_demosaic.cpp).
Notice reproduced verbatim from that file.

Copyright (C) 2010,  Jacek Gozdz (cuniek@kft.umcs.lublin.pl)

This code is licensed under a (3-clause) BSD license as follows :

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following
conditions are met:

* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following
disclaimer in the documentation and/or other materials provided
with the distribution.
* Neither the name of the author nor the names of its
contributors may be used to endorse or promote products
derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
OF SUCH DAMAGE.

DNG SDK License Agreement

NOTICE TO USER: Adobe Inc. provides the Software and Documentation for
use under the terms of this Agreement. Any download, installation,
use, reproduction, modification or distribution of the Software or
Documentation, or any derivatives or portions thereof, constitutes
your acceptance of this Agreement.

As used in this Agreement,

"Adobe" means Adobe Inc.

"Software" means the software code, in any format, including sample
code and source code, accompanying this Agreement.

"Documentation" means the documents, specifications and all other
items accompanying this Agreement other than the Software.

1. LICENSE GRANT Software License. Subject to the restrictions below
and other terms of this Agreement, Adobe hereby grants you a
non-exclusive, worldwide, royalty free license to use, reproduce,
prepare derivative works from, publicly display, publicly perform,
distribute and sublicense the Software for any purpose.

Document License. Subject to the terms of this Agreement, Adobe hereby
grants you a non-exclusive, worldwide, royalty free license to make a
limited number of copies of the Documentation for your development
purposes and to publicly display, publicly perform and distribute such
copies. You may not modify the Documentation.

2. RESTRICTIONS AND OWNERSHIP You will not remove any copyright or
other notice included in the Software or Documentation and you will
include such notices in any copies of the Software that you distribute
in human-readable format.

You will not copy, use, display, modify or distribute the Software or
Documentation in any manner not permitted by this Agreement. No title
to the intellectual property in the Software or Documentation is
transferred to you under the terms of this Agreement. You do not
acquire any rights to the Software or the Documentation except as
expressly set forth in this Agreement. All rights not granted are
reserved by Adobe.

3. DISCLAIMER OF WARRANTY ADOBE PROVIDES THE SOFTWARE AND
DOCUMENTATION ONLY ON AN "AS IS" BASIS WITHOUT WARRANTIES OR
CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT
LIMITATION ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT,
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. ADOBE MAKES NO
WARRANTY THAT THE SOFTWARE OR DOCUMENTATION WILL BE ERROR-FREE. To the
extent permissible, any warranties that are not and cannot be excluded
by the foregoing are limited to ninety (90) days.

4. LIMITATION OF LIABILITY ADOBE AND ITS SUPPLIERS SHALL NOT BE LIABLE
FOR LOSS OR DAMAGE ARISING OUT OF THIS AGREEMENT OR FROM THE USE OF
THE SOFTWARE OR DOCUMENTATION. IN NO EVENT WILL ADOBE BE LIABLE TO YOU
OR ANY THIRD PARTY FOR ANY DIRECT, INDIRECT, CONSEQUENTIAL,
INCIDENTAL, OR SPECIAL DAMAGES INCLUDING LOST PROFITS, LOST SAVINGS,
COSTS, FEES, OR EXPENSES OF ANY KIND ARISING OUT OF ANY PROVISION OF
THIS AGREEMENT OR THE USE OR THE INABILITY TO USE THE SOFTWARE OR
DOCUMENTATION, HOWEVER CAUSED AND UNDER ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE), EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
ADOBE'S AGGREGATE LIABILITY AND THAT OF ITS SUPPLIERS UNDER OR IN
CONNECTION WITH THIS AGREEMENT SHALL BE LIMITED TO THE AMOUNT PAID BY
YOU FOR THE SOFTWARE AND DOCUMENTATION.

5. INDEMNIFICATION If you choose to distribute the Software in a
commercial product, you do so with the understanding that you agree to
defend, indemnify and hold harmless Adobe against any losses, damages
and costs arising from the claims, lawsuits or other legal actions
arising out of such distribution.

6. TRADEMARK USAGE Adobe and the DNG logo are the trademarks or
registered trademarks of Adobe Inc. in the United States and other
countries. Such trademarks may not be used to endorse or promote any
product unless expressly permitted under separate agreement with
Adobe. For information on how to license the DNG logo please go to
www.adobe.com.

7. TERM Your rights under this Agreement shall terminate if you fail
to comply with any of the material terms or conditions of this
Agreement. If all your rights under this Agreement terminate, you will
immediately cease use and distribution of the Software and
Documentation.

8. GOVERNING LAW AND JURISDICTION This Agreement is governed by the
statutes and laws of the State of California, without regard to the
conflicts of law principles thereof. The federal and state courts
located in Santa Clara County, California, USA, will have
non-exclusive jurisdiction over any dispute arising out of this
Agreement.

9. GENERAL This Agreement supersedes any prior agreement, oral or
written, between Adobe and you with respect to the licensing to you of
the Software and Documentation. No variation of the terms of this
Agreement will be enforceable against Adobe unless Adobe gives its
express consent in writing signed by an authorized signatory of Adobe.
If any part of this Agreement is found void and unenforceable, it will
not affect the validity of the balance of the Agreement, which shall
remain valid and enforceable according to its terms.

For licensing information on the DNG File Format Specification, which
is not included in the DNG SDK, please visit:
https://helpx.adobe.com/camera-raw/digital-negative.html

Lossless JPEG code in the Adobe DNG SDK (dng_lossless_jpeg_shared.cpp)
is adapted from the following. Notice reproduced verbatim from that file.

Copyright (C) 1991, 1992, Thomas G. Lane.
Part of the Independent JPEG Group's software.
See the file Copyright for more details.

Copyright (c) 1993 Brian C. Smith, The Regents of the University
of California
All rights reserved.

Copyright (c) 1994 Kongji Huang and Brian C. Smith.
Cornell University
All rights reserved.

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose, without fee, and without written agreement is
hereby granted, provided that the above copyright notice and the following
two paragraphs appear in all copies of this software.

IN NO EVENT SHALL CORNELL UNIVERSITY BE LIABLE TO ANY PARTY FOR
DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF CORNELL
UNIVERSITY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

CORNELL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
ON AN "AS IS" BASIS, AND CORNELL UNIVERSITY HAS NO OBLIGATION TO
PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

MD5 code in the Adobe DNG SDK (dng_fingerprint.cpp). Notice reproduced
verbatim from that file.

Derived from the RSA Data Security, Inc. MD5 Message-Digest Algorithm

Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
rights reserved.

License to copy and use this software is granted provided that it
is identified as the "RSA Data Security, Inc. MD5 Message-Digest
Algorithm" in all material mentioning or referencing this software
or this function.

License is also granted to make and use derivative works provided
that such works are identified as "derived from the RSA Data
Security, Inc. MD5 Message-Digest Algorithm" in all material
mentioning or referencing the derived work.

RSA Data Security, Inc. makes no representations concerning either
the merchantability of this software or the suitability of this
software for any particular purpose. It is provided "as is"
without express or implied warranty of any kind.

These notices must be retained in any copies of any part of this
documentation and/or software.

                                 Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/

   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION

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      "License" shall mean the terms and conditions for use, reproduction,
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      direction or management of such entity, whether by contract or
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      "You" (or "Your") shall mean an individual or Legal Entity
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      "Work" shall mean the work of authorship, whether in Source or
      Object form, made available under the License, as indicated by a
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   APPENDIX: How to apply the Apache License to your work.

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# LibTIFF license

Copyright © 1988-1997 Sam Leffler\
Copyright © 1991-1997 Silicon Graphics, Inc.

Permission to use, copy, modify, distribute, and sell this software and 
its documentation for any purpose is hereby granted without fee, provided
that (i) the above copyright notices and this permission notice appear in
all copies of the software and related documentation, and (ii) the names of
Sam Leffler and Silicon Graphics may not be used in any advertising or
publicity relating to the software without the specific, prior written
permission of Sam Leffler and Silicon Graphics.

THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 
EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  

IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 
LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 
OF THIS SOFTWARE.

# Lempel-Ziv & Welch Compression (tif_lzw.c) license
The code of tif_lzw.c is derived from the compress program whose code is
derived from software contributed to Berkeley by James A. Woods,
derived from original work by Spencer Thomas and Joseph Orost.

The original Berkeley copyright notice appears below in its entirety:

Copyright (c) 1985, 1986 The Regents of the University of California.
All rights reserved.

This code is derived from software contributed to Berkeley by
James A. Woods, derived from original work by Spencer Thomas
and Joseph Orost.

Redistribution and use in source and binary forms are permitted
provided that the above copyright notice and this paragraph are
duplicated in all such forms and that any documentation,
advertising materials, and other materials related to such
distribution and use acknowledge that the software was developed
by the University of California, Berkeley.  The name of the
University may not be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.

Notices in libtiff source files compiled into this product whose copyright
holders or terms differ from the library licence (libtiff.txt). Each is
reproduced verbatim from the head of the file named above it.

----------------------------------------------------------------
libtiff/tif_hash_set.c, libtiff/tif_hash_set.h
----------------------------------------------------------------

Copyright (c) 2008-2009, Even Rouault <even dot rouault at spatialys.com>

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.

----------------------------------------------------------------
libtiff/tif_luv.c
----------------------------------------------------------------

Copyright (c) 1997 Greg Ward Larson
Copyright (c) 1997 Silicon Graphics, Inc.

Permission to use, copy, modify, distribute, and sell this software and
its documentation for any purpose is hereby granted without fee, provided
that (i) the above copyright notices and this permission notice appear in
all copies of the software and related documentation, and (ii) the names of
Sam Leffler, Greg Larson and Silicon Graphics may not be used in any
advertising or publicity relating to the software without the specific,
prior written permission of Sam Leffler, Greg Larson and Silicon Graphics.

THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

IN NO EVENT SHALL SAM LEFFLER, GREG LARSON OR SILICON GRAPHICS BE LIABLE
FOR ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
OF THIS SOFTWARE.

----------------------------------------------------------------
libtiff/tif_pixarlog.c
----------------------------------------------------------------

Copyright (c) 1996-1997 Sam Leffler
Copyright (c) 1996 Pixar

Permission to use, copy, modify, distribute, and sell this software and
its documentation for any purpose is hereby granted without fee, provided
that (i) the above copyright notices and this permission notice appear in
all copies of the software and related documentation, and (ii) the names of
Pixar, Sam Leffler and Silicon Graphics may not be used in any advertising or
publicity relating to the software without the specific, prior written
permission of Pixar, Sam Leffler and Silicon Graphics.

THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

IN NO EVENT SHALL PIXAR, SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
OF THIS SOFTWARE.

----------------------------------------------------------------
libtiff/tif_lzw.c
----------------------------------------------------------------

Copyright (c) 1988-1997 Sam Leffler
Copyright (c) 1991-1997 Silicon Graphics, Inc.
Copyright (c) 2022 Even Rouault

Permission to use, copy, modify, distribute, and sell this software and
its documentation for any purpose is hereby granted without fee, provided
that (i) the above copyright notices and this permission notice appear in
all copies of the software and related documentation, and (ii) the names of
Sam Leffler and Silicon Graphics may not be used in any advertising or
publicity relating to the software without the specific, prior written
permission of Sam Leffler and Silicon Graphics.

THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
OF THIS SOFTWARE.

----------------------------------------------------------------
libtiff/tif_fax3.c, libtiff/tif_fax3.h
----------------------------------------------------------------

Decoder support is derived, with permission, from the code
in Frank Cringle's viewfax program;
     Copyright (C) 1990, 1995  Frank D. Cringle.

----------------------------------------------------------------
libtiff/tif_ojpeg.c
----------------------------------------------------------------

Copyright (c) Joris Van Damme <info@awaresystems.be>
Copyright (c) AWare Systems <http://www.awaresystems.be/>

The licence agreement for this file is the same as the rest of the LibTiff
library.

IN NO EVENT SHALL JORIS VAN DAMME OR AWARE SYSTEMS BE LIABLE FOR
ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
OF THIS SOFTWARE.

libjpeg-turbo Licenses
======================

libjpeg-turbo is covered by two compatible BSD-style open source licenses:

- The IJG (Independent JPEG Group) License, which is listed in
  [README.ijg](README.ijg)

  This license applies to the libjpeg API library and associated programs,
  including any code inherited from libjpeg and any modifications to that
  code.

- The Modified (3-clause) BSD License, which is listed below

  This license applies to the TurboJPEG API library and associated programs,
  [libspng](https://libspng.org) (which is used by cjpeg and djpeg), and the
  build/test system.

  * The TurboJPEG API library wraps the libjpeg API library, so in the context
    of the overall TurboJPEG API library, both the terms of the IJG License and
    the terms of the Modified (3-clause) BSD License apply.
  * cjpeg and djpeg use libspng, so in the context of those programs, both the
    terms of the IJG License and the terms of the Modified (3-clause) BSD
    License apply.


Component Licenses
==================

Some of libjpeg-turbo's modules and internal dependencies are covered by less
restrictive licenses, but in the context of libjpeg-turbo as a whole, the terms
of the less restrictive licenses are subsumed by either the IJG License or the
Modified BSD License.  (In other words, the terms of the less restrictive
licenses are satisfied if the terms of the IJG and Modified BSD Licenses are
satisfied.)

- The libjpeg-turbo SIMD source code and zlib are covered by the
  [zlib License](https://spdx.org/licenses/Zlib.html), which is subsumed by the
  IJG License in the context of the cjpeg and djpeg programs and the libjpeg
  API library.

- Some of the libspng source code is covered by the
  [PNG Reference Library License v2](https://spdx.org/licenses/libpng-2.0.html),
  which is subsumed by the IJG License in the context of the cjpeg and djpeg
  programs and the TurboJPEG API library.

- Most of the libspng source code is covered by the
  [Simplified (2-clause) BSD License](https://spdx.org/licenses/BSD-2-Clause.html),
  which is subsumed by the Modified BSD License in the context of the cjpeg and
  djpeg programs and the TurboJPEG API library.


Complying with the libjpeg-turbo Licenses
=========================================

This section provides a roll-up of the libjpeg-turbo licensing terms, to the
best of our understanding.  This is not a license in and of itself.  It is
intended solely for clarification.

1.  If you are distributing a modified version of the libjpeg-turbo source,
    then:

    1.  You cannot alter or remove any existing copyright or license notices
        from the source.

        **Origin**
        - Clause 1 of the IJG License
        - Clause 1 of the Modified BSD License

    2.  You must add your own copyright notice to the header of each source
        file you modified, so others can tell that you modified that file.  (If
        there is not an existing copyright header in that file, then you can
        simply add a notice stating that you modified the file.)

        **Origin**
        - Clause 1 of the IJG License

    3.  You must include the IJG README file, and you must not alter any of the
        copyright or license text in that file.

        **Origin**
        - Clause 1 of the IJG License

2.  If you are distributing only libjpeg-turbo binaries without the source, or
    if you are distributing an application that statically links with
    libjpeg-turbo, then:

    1.  Your product documentation must include a message stating:

        This software is based in part on the work of the Independent JPEG
        Group.

        **Origin**
        - Clause 2 of the IJG license

    2.  If your binary distribution includes or uses the TurboJPEG API or
        associated programs, cjpeg, or djpeg, then your product documentation
        must include the text of the Modified BSD License (see below.)

        **Origin**
        - Clause 2 of the Modified BSD License

3.  You cannot use the name of the IJG or The libjpeg-turbo Project or the
    contributors thereof in advertising, publicity, etc.

    **Origin**
    - IJG License
    - Clause 3 of the Modified BSD License

4.  The authors and distributors do not warrant libjpeg-turbo to be free of
    defects, nor do we accept any liability for undesirable consequences
    resulting from your use of the software.

    **Origin**
    - IJG License
    - Modified BSD License


The Modified (3-clause) BSD License
===================================

Copyright (C) 2009-2026 D. R. Commander<br>
Copyright (C) 2018-2023 Randy <randy408@protonmail.com>

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

- Redistributions of source code must retain the above copyright notice,
  this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.
- Neither the name of the libjpeg-turbo Project nor the names of its
  contributors may be used to endorse or promote products derived from this
  software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS",
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.

libjpeg-turbo note:  This file has been modified by The libjpeg-turbo Project
to include only information relevant to libjpeg-turbo, to wordsmith certain
sections, and to remove impolitic language that existed in the libjpeg v8
README.  It is included only for reference.  Please see README.md for
information specific to libjpeg-turbo.


The Independent JPEG Group's JPEG software
==========================================

This distribution contains a 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.

This software is the work of Tom Lane, Guido Vollbeding, Philip Gladstone,
Bill Allombert, Jim Boucher, Lee Crocker, Bob Friesenhahn, Ben Jackson,
Julian Minguillon, Luis Ortiz, George Phillips, Davide Rossi, Ge' Weijers,
and other members of the Independent JPEG Group.

IJG is not affiliated with the ISO/IEC JTC1/SC29/WG1 standards committee
(also known as JPEG, together with ITU-T SG16).


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.
FILE FORMAT WARS    Software *not* to get.
TO DO               Plans for future IJG releases.

Other documentation files in the distribution are:

User documentation:
  doc/usage.txt         Usage instructions for cjpeg, djpeg, jpegtran,
                        rdjpgcom, and wrjpgcom.
  doc/*.1               Unix-style man pages for programs (same info as
                        usage.txt).
  doc/wizard.txt        Advanced usage instructions for JPEG wizards only.
  doc/change.log        Version-to-version change highlights.
Programmer and internal documentation:
  doc/libjpeg.txt       How to use the JPEG library in your own programs.
  src/example.c         Sample code for calling the JPEG library.
  doc/structure.txt     Overview of the JPEG library's internal structure.
  doc/coderules.txt     Coding style rules --- please read if you contribute
                        code.

Please read at least usage.txt.  Some 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 encoding, decoding,
and transcoding.  JPEG (pronounced "jay-peg") is a standardized compression
method for full-color and grayscale images.  JPEG's strong suit is compressing
photographic images or other types of images that have smooth color and
brightness transitions between neighboring pixels.  Images with sharp lines or
other abrupt features may not compress well with JPEG, and a higher JPEG
quality may have to be used to avoid visible compression artifacts with such
images.

JPEG is normally lossy, meaning that the output pixels are not necessarily
identical to the input pixels.  However, on photographic content and other
"smooth" images, very good compression ratios can be obtained with no visible
compression artifacts, and extremely high compression ratios are possible if
you are willing to sacrifice image quality (by reducing the "quality" setting
in the compressor.)

This software implements JPEG baseline, extended-sequential, progressive, and
lossless compression processes.  Provision is made for supporting all variants
of these processes, although some uncommon parameter settings aren't
implemented yet.  We have made no provision for supporting the hierarchical
processes defined in the standard.

We provide a set of library routines for reading and writing JPEG image files,
plus two sample 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.

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.  These
extra functions can be compiled out of the library if not required for a
particular application.

We have also included "jpegtran", a utility for lossless transcoding between
different JPEG processes, and "rdjpgcom" and "wrjpgcom", 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.)  Rather, it is intended to
be reliable, portable, industrial-strength code.  We do not claim to have
achieved that goal in every aspect of the software, but we strive for it.

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) 1991-2020, Thomas G. Lane, Guido Vollbeding.
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.


REFERENCES
==========

We 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 PDF file containing a revised version of Wallace's article is
available at http://www.ijg.org/files/Wallace.JPEG.pdf.  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 currently available 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).

The original JPEG 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 numbers ISO/IEC IS
10918-1, ITU-T T.81.  Part 2 is titled "Digital Compression and Coding of
Continuous-tone Still Images, Part 2: Compliance testing" and has document
numbers ISO/IEC IS 10918-2, ITU-T T.83.

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.  JFIF version 1 has been adopted as ISO/IEC 10918-5 (05/2013) and
Recommendation ITU-T T.871 (05/2011): Information technology - Digital
compression and coding of continuous-tone still images: JPEG File Interchange
Format (JFIF).  It is available as a free download in PDF file format from
https://www.iso.org/standard/54989.html and http://www.itu.int/rec/T-REC-T.871.
A PDF file of the older JFIF 1.02 specification is available at
http://www.w3.org/Graphics/JPEG/jfif3.pdf.

The TIFF 6.0 file format specification can be obtained from
http://mirrors.ctan.org/graphics/tiff/TIFF6.ps.gz.  The JPEG incorporation
scheme found in the TIFF 6.0 spec of 3-June-92 has a number of serious
problems.  IJG does not recommend use of the TIFF 6.0 design (TIFF Compression
tag 6).  Instead, we recommend the JPEG design proposed by TIFF Technical Note
#2 (Compression tag 7).  Copies of this Note can be obtained from
http://www.ijg.org/files/.  It is expected that the next revision
of the TIFF spec will replace the 6.0 JPEG design with the Note's design.
Although IJG's own code does not support TIFF/JPEG, the free libtiff library
uses our library to implement TIFF/JPEG per the Note.


ARCHIVE LOCATIONS
=================

The "official" archive site for this software is www.ijg.org.
The most recent released version can always be found there in
directory "files".

The JPEG FAQ (Frequently Asked Questions) article is a source of some
general information about JPEG.  It is available at
http://www.faqs.org/faqs/jpeg-faq.


FILE FORMAT COMPATIBILITY
=========================

This software implements ITU T.81 | ISO/IEC 10918 with some extensions from
ITU T.871 | ISO/IEC 10918-5 (JPEG File Interchange Format-- see REFERENCES).
Informally, the term "JPEG image" or "JPEG file" most often refers to JFIF or
a subset thereof, but there are other formats containing the name "JPEG" that
are incompatible with the original JPEG standard or with JFIF (for instance,
JPEG 2000 and JPEG XR).  This software therefore does not support these
formats.  Indeed, one of the original reasons for developing this free software
was to help force convergence on a common, interoperable format standard for
JPEG files.

JFIF is a minimal or "low end" representation.  TIFF/JPEG (TIFF revision 6.0 as
modified by TIFF Technical Note #2) can be used for "high end" applications
that need to record a lot of additional data about an image.


TO DO
=====

Please send bug reports, offers of help, etc. to jpeg-info@jpegclub.org.

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==============================================================================

Copyright (C) 1995-2022 Jean-loup Gailly and Mark Adler

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Jean-loup Gailly        Mark Adler
jloup@gzip.org          madler@alumni.caltech.edu