kopia lustrzana https://gitlab.com/sane-project/website
Added information about the SANE license.
Henning Geinitz
rodzic
40a374ec7c
commit
8404165c93
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|||
GNU GENERAL PUBLIC LICENSE
|
||||
Version 2, June 1991
|
||||
|
||||
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
|
||||
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||||
Everyone is permitted to copy and distribute verbatim copies
|
||||
of this license document, but changing it is not allowed.
|
||||
|
||||
Preamble
|
||||
|
||||
The licenses for most software are designed to take away your
|
||||
freedom to share and change it. By contrast, the GNU General Public
|
||||
License is intended to guarantee your freedom to share and change free
|
||||
software--to make sure the software is free for all its users. This
|
||||
General Public License applies to most of the Free Software
|
||||
Foundation's software and to any other program whose authors commit to
|
||||
using it. (Some other Free Software Foundation software is covered by
|
||||
the GNU Library General Public License instead.) You can apply it to
|
||||
your programs, too.
|
||||
|
||||
When we speak of free software, we are referring to freedom, not
|
||||
price. Our General Public Licenses are designed to make sure that you
|
||||
have the freedom to distribute copies of free software (and charge for
|
||||
this service if you wish), that you receive source code or can get it
|
||||
if you want it, that you can change the software or use pieces of it
|
||||
in new free programs; and that you know you can do these things.
|
||||
|
||||
To protect your rights, we need to make restrictions that forbid
|
||||
anyone to deny you these rights or to ask you to surrender the rights.
|
||||
These restrictions translate to certain responsibilities for you if you
|
||||
distribute copies of the software, or if you modify it.
|
||||
|
||||
For example, if you distribute copies of such a program, whether
|
||||
gratis or for a fee, you must give the recipients all the rights that
|
||||
you have. You must make sure that they, too, receive or can get the
|
||||
source code. And you must show them these terms so they know their
|
||||
rights.
|
||||
|
||||
We protect your rights with two steps: (1) copyright the software, and
|
||||
(2) offer you this license which gives you legal permission to copy,
|
||||
distribute and/or modify the software.
|
||||
|
||||
Also, for each author's protection and ours, we want to make certain
|
||||
that everyone understands that there is no warranty for this free
|
||||
software. If the software is modified by someone else and passed on, we
|
||||
want its recipients to know that what they have is not the original, so
|
||||
that any problems introduced by others will not reflect on the original
|
||||
authors' reputations.
|
||||
|
||||
Finally, any free program is threatened constantly by software
|
||||
patents. We wish to avoid the danger that redistributors of a free
|
||||
program will individually obtain patent licenses, in effect making the
|
||||
program proprietary. To prevent this, we have made it clear that any
|
||||
patent must be licensed for everyone's free use or not licensed at all.
|
||||
|
||||
The precise terms and conditions for copying, distribution and
|
||||
modification follow.
|
||||
|
||||
GNU GENERAL PUBLIC LICENSE
|
||||
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
|
||||
|
||||
0. This License applies to any program or other work which contains
|
||||
a notice placed by the copyright holder saying it may be distributed
|
||||
under the terms of this General Public License. The "Program", below,
|
||||
refers to any such program or work, and a "work based on the Program"
|
||||
means either the Program or any derivative work under copyright law:
|
||||
that is to say, a work containing the Program or a portion of it,
|
||||
either verbatim or with modifications and/or translated into another
|
||||
language. (Hereinafter, translation is included without limitation in
|
||||
the term "modification".) Each licensee is addressed as "you".
|
||||
|
||||
Activities other than copying, distribution and modification are not
|
||||
covered by this License; they are outside its scope. The act of
|
||||
running the Program is not restricted, and the output from the Program
|
||||
is covered only if its contents constitute a work based on the
|
||||
Program (independent of having been made by running the Program).
|
||||
Whether that is true depends on what the Program does.
|
||||
|
||||
1. You may copy and distribute verbatim copies of the Program's
|
||||
source code as you receive it, in any medium, provided that you
|
||||
conspicuously and appropriately publish on each copy an appropriate
|
||||
copyright notice and disclaimer of warranty; keep intact all the
|
||||
notices that refer to this License and to the absence of any warranty;
|
||||
and give any other recipients of the Program a copy of this License
|
||||
along with the Program.
|
||||
|
||||
You may charge a fee for the physical act of transferring a copy, and
|
||||
you may at your option offer warranty protection in exchange for a fee.
|
||||
|
||||
2. You may modify your copy or copies of the Program or any portion
|
||||
of it, thus forming a work based on the Program, and copy and
|
||||
distribute such modifications or work under the terms of Section 1
|
||||
above, provided that you also meet all of these conditions:
|
||||
|
||||
a) You must cause the modified files to carry prominent notices
|
||||
stating that you changed the files and the date of any change.
|
||||
|
||||
b) You must cause any work that you distribute or publish, that in
|
||||
whole or in part contains or is derived from the Program or any
|
||||
part thereof, to be licensed as a whole at no charge to all third
|
||||
parties under the terms of this License.
|
||||
|
||||
c) If the modified program normally reads commands interactively
|
||||
when run, you must cause it, when started running for such
|
||||
interactive use in the most ordinary way, to print or display an
|
||||
announcement including an appropriate copyright notice and a
|
||||
notice that there is no warranty (or else, saying that you provide
|
||||
a warranty) and that users may redistribute the program under
|
||||
these conditions, and telling the user how to view a copy of this
|
||||
License. (Exception: if the Program itself is interactive but
|
||||
does not normally print such an announcement, your work based on
|
||||
the Program is not required to print an announcement.)
|
||||
|
||||
These requirements apply to the modified work as a whole. If
|
||||
identifiable sections of that work are not derived from the Program,
|
||||
and can be reasonably considered independent and separate works in
|
||||
themselves, then this License, and its terms, do not apply to those
|
||||
sections when you distribute them as separate works. But when you
|
||||
distribute the same sections as part of a whole which is a work based
|
||||
on the Program, the distribution of the whole must be on the terms of
|
||||
this License, whose permissions for other licensees extend to the
|
||||
entire whole, and thus to each and every part regardless of who wrote it.
|
||||
|
||||
Thus, it is not the intent of this section to claim rights or contest
|
||||
your rights to work written entirely by you; rather, the intent is to
|
||||
exercise the right to control the distribution of derivative or
|
||||
collective works based on the Program.
|
||||
|
||||
In addition, mere aggregation of another work not based on the Program
|
||||
with the Program (or with a work based on the Program) on a volume of
|
||||
a storage or distribution medium does not bring the other work under
|
||||
the scope of this License.
|
||||
|
||||
3. You may copy and distribute the Program (or a work based on it,
|
||||
under Section 2) in object code or executable form under the terms of
|
||||
Sections 1 and 2 above provided that you also do one of the following:
|
||||
|
||||
a) Accompany it with the complete corresponding machine-readable
|
||||
source code, which must be distributed under the terms of Sections
|
||||
1 and 2 above on a medium customarily used for software interchange; or,
|
||||
|
||||
b) Accompany it with a written offer, valid for at least three
|
||||
years, to give any third party, for a charge no more than your
|
||||
cost of physically performing source distribution, a complete
|
||||
machine-readable copy of the corresponding source code, to be
|
||||
distributed under the terms of Sections 1 and 2 above on a medium
|
||||
customarily used for software interchange; or,
|
||||
|
||||
c) Accompany it with the information you received as to the offer
|
||||
to distribute corresponding source code. (This alternative is
|
||||
allowed only for noncommercial distribution and only if you
|
||||
received the program in object code or executable form with such
|
||||
an offer, in accord with Subsection b above.)
|
||||
|
||||
The source code for a work means the preferred form of the work for
|
||||
making modifications to it. For an executable work, complete source
|
||||
code means all the source code for all modules it contains, plus any
|
||||
associated interface definition files, plus the scripts used to
|
||||
control compilation and installation of the executable. However, as a
|
||||
special exception, the source code distributed need not include
|
||||
anything that is normally distributed (in either source or binary
|
||||
form) with the major components (compiler, kernel, and so on) of the
|
||||
operating system on which the executable runs, unless that component
|
||||
itself accompanies the executable.
|
||||
|
||||
If distribution of executable or object code is made by offering
|
||||
access to copy from a designated place, then offering equivalent
|
||||
access to copy the source code from the same place counts as
|
||||
distribution of the source code, even though third parties are not
|
||||
compelled to copy the source along with the object code.
|
||||
|
||||
4. You may not copy, modify, sublicense, or distribute the Program
|
||||
except as expressly provided under this License. Any attempt
|
||||
otherwise to copy, modify, sublicense or distribute the Program is
|
||||
void, and will automatically terminate your rights under this License.
|
||||
However, parties who have received copies, or rights, from you under
|
||||
this License will not have their licenses terminated so long as such
|
||||
parties remain in full compliance.
|
||||
|
||||
5. You are not required to accept this License, since you have not
|
||||
signed it. However, nothing else grants you permission to modify or
|
||||
distribute the Program or its derivative works. These actions are
|
||||
prohibited by law if you do not accept this License. Therefore, by
|
||||
modifying or distributing the Program (or any work based on the
|
||||
Program), you indicate your acceptance of this License to do so, and
|
||||
all its terms and conditions for copying, distributing or modifying
|
||||
the Program or works based on it.
|
||||
|
||||
6. Each time you redistribute the Program (or any work based on the
|
||||
Program), the recipient automatically receives a license from the
|
||||
original licensor to copy, distribute or modify the Program subject to
|
||||
these terms and conditions. You may not impose any further
|
||||
restrictions on the recipients' exercise of the rights granted herein.
|
||||
You are not responsible for enforcing compliance by third parties to
|
||||
this License.
|
||||
|
||||
7. If, as a consequence of a court judgment or allegation of patent
|
||||
infringement or for any other reason (not limited to patent issues),
|
||||
conditions are imposed on you (whether by court order, agreement or
|
||||
otherwise) that contradict the conditions of this License, they do not
|
||||
excuse you from the conditions of this License. If you cannot
|
||||
distribute so as to satisfy simultaneously your obligations under this
|
||||
License and any other pertinent obligations, then as a consequence you
|
||||
may not distribute the Program at all. For example, if a patent
|
||||
license would not permit royalty-free redistribution of the Program by
|
||||
all those who receive copies directly or indirectly through you, then
|
||||
the only way you could satisfy both it and this License would be to
|
||||
refrain entirely from distribution of the Program.
|
||||
|
||||
If any portion of this section is held invalid or unenforceable under
|
||||
any particular circumstance, the balance of the section is intended to
|
||||
apply and the section as a whole is intended to apply in other
|
||||
circumstances.
|
||||
|
||||
It is not the purpose of this section to induce you to infringe any
|
||||
patents or other property right claims or to contest validity of any
|
||||
such claims; this section has the sole purpose of protecting the
|
||||
integrity of the free software distribution system, which is
|
||||
implemented by public license practices. Many people have made
|
||||
generous contributions to the wide range of software distributed
|
||||
through that system in reliance on consistent application of that
|
||||
system; it is up to the author/donor to decide if he or she is willing
|
||||
to distribute software through any other system and a licensee cannot
|
||||
impose that choice.
|
||||
|
||||
This section is intended to make thoroughly clear what is believed to
|
||||
be a consequence of the rest of this License.
|
||||
|
||||
8. If the distribution and/or use of the Program is restricted in
|
||||
certain countries either by patents or by copyrighted interfaces, the
|
||||
original copyright holder who places the Program under this License
|
||||
may add an explicit geographical distribution limitation excluding
|
||||
those countries, so that distribution is permitted only in or among
|
||||
countries not thus excluded. In such case, this License incorporates
|
||||
the limitation as if written in the body of this License.
|
||||
|
||||
9. The Free Software Foundation may publish revised and/or new versions
|
||||
of the General Public License from time to time. Such new versions will
|
||||
be similar in spirit to the present version, but may differ in detail to
|
||||
address new problems or concerns.
|
||||
|
||||
Each version is given a distinguishing version number. If the Program
|
||||
specifies a version number of this License which applies to it and "any
|
||||
later version", you have the option of following the terms and conditions
|
||||
either of that version or of any later version published by the Free
|
||||
Software Foundation. If the Program does not specify a version number of
|
||||
this License, you may choose any version ever published by the Free Software
|
||||
Foundation.
|
||||
|
||||
10. If you wish to incorporate parts of the Program into other free
|
||||
programs whose distribution conditions are different, write to the author
|
||||
to ask for permission. For software which is copyrighted by the Free
|
||||
Software Foundation, write to the Free Software Foundation; we sometimes
|
||||
make exceptions for this. Our decision will be guided by the two goals
|
||||
of preserving the free status of all derivatives of our free software and
|
||||
of promoting the sharing and reuse of software generally.
|
||||
|
||||
NO WARRANTY
|
||||
|
||||
11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
|
||||
FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
|
||||
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
|
||||
PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
|
||||
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
||||
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
|
||||
TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
|
||||
PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
|
||||
REPAIR OR CORRECTION.
|
||||
|
||||
12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
|
||||
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
|
||||
REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
|
||||
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
|
||||
OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
|
||||
TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
|
||||
YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
|
||||
PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
|
||||
POSSIBILITY OF SUCH DAMAGES.
|
||||
|
||||
END OF TERMS AND CONDITIONS
|
||||
|
||||
How to Apply These Terms to Your New Programs
|
||||
|
||||
If you develop a new program, and you want it to be of the greatest
|
||||
possible use to the public, the best way to achieve this is to make it
|
||||
free software which everyone can redistribute and change under these terms.
|
||||
|
||||
To do so, attach the following notices to the program. It is safest
|
||||
to attach them to the start of each source file to most effectively
|
||||
convey the exclusion of warranty; and each file should have at least
|
||||
the "copyright" line and a pointer to where the full notice is found.
|
||||
|
||||
<one line to give the program's name and a brief idea of what it does.>
|
||||
Copyright (C) 19yy <name of author>
|
||||
|
||||
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
|
||||
|
||||
|
||||
Also add information on how to contact you by electronic and paper mail.
|
||||
|
||||
If the program is interactive, make it output a short notice like this
|
||||
when it starts in an interactive mode:
|
||||
|
||||
Gnomovision version 69, Copyright (C) 19yy name of author
|
||||
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
|
||||
This is free software, and you are welcome to redistribute it
|
||||
under certain conditions; type `show c' for details.
|
||||
|
||||
The hypothetical commands `show w' and `show c' should show the appropriate
|
||||
parts of the General Public License. Of course, the commands you use may
|
||||
be called something other than `show w' and `show c'; they could even be
|
||||
mouse-clicks or menu items--whatever suits your program.
|
||||
|
||||
You should also get your employer (if you work as a programmer) or your
|
||||
school, if any, to sign a "copyright disclaimer" for the program, if
|
||||
necessary. Here is a sample; alter the names:
|
||||
|
||||
Yoyodyne, Inc., hereby disclaims all copyright interest in the program
|
||||
`Gnomovision' (which makes passes at compilers) written by James Hacker.
|
||||
|
||||
<signature of Ty Coon>, 1 April 1989
|
||||
Ty Coon, President of Vice
|
||||
|
||||
This General Public License does not permit incorporating your program into
|
||||
proprietary programs. If your program is a subroutine library, you may
|
||||
consider it more useful to permit linking proprietary applications with the
|
||||
library. If this is what you want to do, use the GNU Library General
|
||||
Public License instead of this License.
|
||||
|
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@ -0,0 +1,31 @@
|
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Sat Jul 26 2003
|
||||
|
||||
This files attempts to clarify the licensing situation for the SANE
|
||||
distribution. In case of doubt, the copyright information contained
|
||||
in each file overrides what is said here.
|
||||
|
||||
SANE consists of three parts each of which has its own licensing
|
||||
terms:
|
||||
|
||||
* The frontend programs.
|
||||
|
||||
These programs are generally protected by the GNU General Public
|
||||
License. (See file COPYING.)
|
||||
|
||||
* The backend libraries.
|
||||
|
||||
Most backend libraries are protected by the GNU General Public License
|
||||
(see file COPYING), but as an exception, it is permissible to link against
|
||||
such a library without affecting the licensing status of the program
|
||||
that uses the libraries. For details, see the copyright notice at the
|
||||
head of the backend files (e.g., backend/dll.c).
|
||||
|
||||
Note that not all of the backends apply the exception and that some have
|
||||
additional licensing constraints. E.g., the DC210 backend uses JPG code
|
||||
that is licensed as described in README.djpeg.
|
||||
|
||||
* The SANE API and network protocol as put forth in the standard document.
|
||||
|
||||
The standard is considered to be in the public domain. Anyone is free
|
||||
to implement SANE interface conforming applications or libraries in
|
||||
any way he or she sees fit.
|
||||
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@ -0,0 +1,390 @@
|
|||
The JPEG decoder in SANE is taken mostly without change from The
|
||||
Independent JPEG Group's JPEG software, release 6a. Their "djpeg.README"
|
||||
file is included below. The only changes are to file names, e.g.
|
||||
djpeg.c -> sanei_jpeg.c, and function names,
|
||||
e.g. sanei_jpeg_start_output_ppm()
|
||||
|
||||
|
||||
The Independent JPEG Group's JPEG software
|
||||
==========================================
|
||||
|
||||
README for release 6a of 7-Feb-96
|
||||
=================================
|
||||
|
||||
This distribution contains the sixth 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 IJG at 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, Julian Minguillon, George Phillips, Davide Rossi,
|
||||
Ge' Weijers, and other members of the Independent JPEG Group.
|
||||
|
||||
IJG is not affiliated 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, jpegtran,
|
||||
rdjpgcom, and wrjpgcom.
|
||||
*.1 Unix-style man pages for programs (same info as usage.doc).
|
||||
wizard.doc Advanced usage instructions for JPEG wizards only.
|
||||
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; line drawings, cartoons and other non-realistic images
|
||||
are not its strong suit. JPEG is lossy, meaning that the output image is not
|
||||
exactly identical to the input image. Hence you must not use JPEG if you
|
||||
have to have identical output bits. However, on typical photographic images,
|
||||
very good compression levels can be obtained with no visible change, and
|
||||
remarkably 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.
|
||||
|
||||
This software implements JPEG baseline, extended-sequential, and progressive
|
||||
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
|
||||
variants of JPEG; see LEGAL ISSUES. We have made no provision for supporting
|
||||
the hierarchical or lossless 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 or
|
||||
colormapped displays. 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) 1991-1996, 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 with GNU Autoconf. It
|
||||
is copyright by the Free Software Foundation but is freely distributable.
|
||||
|
||||
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.
|
||||
|
||||
WARNING: Unisys has begun to enforce their patent on LZW compression against
|
||||
GIF encoders and decoders. You will need a license from Unisys to use the
|
||||
included rdgif.c or wrgif.c files in a commercial or shareware application.
|
||||
At this time, Unisys is not enforcing their patent against freeware, so
|
||||
distribution of this package remains legal. However, we intend to remove
|
||||
GIF support from the IJG package as soon as a suitable replacement format
|
||||
becomes reasonably popular.
|
||||
|
||||
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 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, 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 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)
|
||||
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 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.
|
||||
|
||||
Extensions to the original JPEG standard are defined in JPEG Part 3, a new ISO
|
||||
document. Part 3 is undergoing ISO balloting and is expected to be approved
|
||||
by the end of 1995; it will have document numbers ISO/IEC IS 10918-3, ITU-T
|
||||
T.84. IJG currently does not support any Part 3 extensions.
|
||||
|
||||
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. 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 sgi.com or
|
||||
from ftp.uu.net:/graphics/jpeg/. 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. libtiff is available
|
||||
from sgi.com:/graphics/tiff/.
|
||||
|
||||
|
||||
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.v6a.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. However, only
|
||||
ftp.uu.net is guaranteed to have the latest official version.
|
||||
|
||||
You can also obtain this software in DOS-compatible "zip" archive format from
|
||||
the SimTel archives (ftp.coast.net:/SimTel/msdos/graphics/), or on CompuServe
|
||||
in the Graphics Support forum (GO CIS:GRAPHSUP), library 12 "JPEG Tools".
|
||||
Again, these versions may sometimes lag behind the ftp.uu.net release.
|
||||
|
||||
The JPEG FAQ (Frequently Asked Questions) article is a useful source of
|
||||
general information about JPEG. It is updated constantly and therefore is
|
||||
not included in this distribution. The FAQ is posted every two weeks to
|
||||
Usenet newsgroups comp.graphics.misc, news.answers, and other groups.
|
||||
You can always obtain the latest version from the news.answers archive at
|
||||
rtfm.mit.edu. By FTP, fetch /pub/usenet/news.answers/jpeg-faq/part1 and
|
||||
.../part2. If you don't have FTP, send e-mail to mail-server@rtfm.mit.edu
|
||||
with body
|
||||
send usenet/news.answers/jpeg-faq/part1
|
||||
send usenet/news.answers/jpeg-faq/part2
|
||||
|
||||
|
||||
RELATED SOFTWARE
|
||||
================
|
||||
|
||||
Numerous viewing and image manipulation programs now support JPEG. (Quite a
|
||||
few of them use this library to do so.) The JPEG FAQ described above lists
|
||||
some of the more popular free and shareware viewers, and tells where to
|
||||
obtain them on Internet.
|
||||
|
||||
If you are on a Unix machine, we highly recommend Jef Poskanzer's free
|
||||
PBMPLUS 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
|
||||
is easier to read and modify. Also, the PVRG code supports lossless JPEG,
|
||||
which we do not.
|
||||
|
||||
|
||||
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.
|
||||
We recommend the use of TIFF/JPEG (TIFF revision 6.0 as modified by TIFF
|
||||
Technical Note #2) for "high end" applications that need to record a lot of
|
||||
additional data about an image. TIFF/JPEG is fairly new and not yet widely
|
||||
supported, unfortunately.
|
||||
|
||||
The upcoming JPEG Part 3 standard defines a file format called SPIFF.
|
||||
SPIFF is interoperable with JFIF, in the sense that most JFIF decoders should
|
||||
be able to read the most common variant of SPIFF. SPIFF has some technical
|
||||
advantages over JFIF, but its major claim to fame is simply that it is an
|
||||
official standard rather than an informal one. At this point it is unclear
|
||||
whether SPIFF will supersede JFIF or whether JFIF will remain the de-facto
|
||||
standard. IJG intends to support SPIFF once the standard is frozen, but we
|
||||
have not decided whether it should become our default output format or not.
|
||||
(In any case, our decoder will remain capable of reading JFIF indefinitely.)
|
||||
|
||||
Various proprietary file formats incorporating JPEG compression also exist.
|
||||
We have little or no sympathy for the existence of these formats. Indeed,
|
||||
one of the original reasons for developing this free software was to help
|
||||
force convergence on common, open format standards for JPEG files. Don't
|
||||
use a proprietary file format!
|
||||
|
||||
|
||||
TO DO
|
||||
=====
|
||||
|
||||
In future versions, we are considering supporting some of the upcoming JPEG
|
||||
Part 3 extensions --- principally, variable quantization and the SPIFF file
|
||||
format.
|
||||
|
||||
Tuning the software for better behavior at low quality/high compression
|
||||
settings is also of interest. The current method for scaling the
|
||||
quantization tables is known not to be very good at low Q values.
|
||||
|
||||
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.
|
||||
|
|
@ -0,0 +1,44 @@
|
|||
/* sane - Scanner Access Now Easy.
|
||||
Copyright (C) 1996, 1997 David Mosberger-Tang
|
||||
This file is part of the SANE package.
|
||||
|
||||
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.
|
||||
|
||||
As a special exception, the authors of SANE give permission for
|
||||
additional uses of the libraries contained in this release of SANE.
|
||||
|
||||
The exception is that, if you link a SANE library with other files
|
||||
to produce an executable, this does not by itself cause the
|
||||
resulting executable to be covered by the GNU General Public
|
||||
License. Your use of that executable is in no way restricted on
|
||||
account of linking the SANE library code into it.
|
||||
|
||||
This exception does not, however, invalidate any other reasons why
|
||||
the executable file might be covered by the GNU General Public
|
||||
License.
|
||||
|
||||
If you submit changes to SANE to the maintainers to be included in
|
||||
a subsequent release, you agree by submitting the changes that
|
||||
those changes may be distributed with this exception intact.
|
||||
|
||||
If you write modifications of your own for SANE, it is your choice
|
||||
whether to permit this exception to apply to your modifications.
|
||||
If you do not wish that, delete this exception notice.
|
||||
|
||||
This file implements a dynamic linking based SANE meta backend. It
|
||||
allows managing an arbitrary number of SANE backends by using
|
||||
dynamic linking to load backends on demand. */
|
||||
|
||||
|
|
@ -0,0 +1,89 @@
|
|||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
|
||||
|
||||
<html>
|
||||
<head>
|
||||
<title>SANE - License</title>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<meta name="author" content="Henning Meier-Geinitz">
|
||||
<meta name="keywords" content="sane, scanner, License, GPL, SANE exception, public domain">
|
||||
<meta name="description" content="Discussion of SANE license issues">
|
||||
<link href="mailto:hmg-guest@users.alioth.debian.org" rev="made">
|
||||
<link rel="icon" href="favicon.ico" type="image/x-icon">
|
||||
<link rel="shortcut icon" href="favicon.ico" type="image/x-icon">
|
||||
</head>
|
||||
|
||||
<body bgcolor="#FFFFFF" text="#000000">
|
||||
<center>
|
||||
<a href="http://www.sane-project.org"><img src="images/sane.png"
|
||||
alt="SANE" height="117" width="346" border="0"></a>
|
||||
</center>
|
||||
|
||||
<center>
|
||||
<h1>SANE - License</h1>
|
||||
</center>
|
||||
|
||||
<hr>
|
||||
|
||||
<p>
|
||||
The information on this page is copied from the <a
|
||||
href="LICENSE">LICENSE</a> file that is included in the sane-backends
|
||||
distribution. It's only changed to use HTML and some links were added.
|
||||
</p>
|
||||
<p>
|
||||
This files attempts to clarify the licensing situation for the SANE
|
||||
distribution. In case of doubt, the copyright information contained in
|
||||
each file overrides what is said here.
|
||||
</p>
|
||||
<p>
|
||||
SANE consists of three parts each of which has its own licensing
|
||||
terms:
|
||||
</p>
|
||||
<blockquote>
|
||||
<dl>
|
||||
<dt>
|
||||
The frontend programs.
|
||||
</dt>
|
||||
<dd>
|
||||
These programs are generally protected by the GNU General Public
|
||||
License. (See file <a href="COPYING">COPYING</a>.)
|
||||
</dd>
|
||||
|
||||
<dt>
|
||||
The backend libraries.
|
||||
</dt>
|
||||
<dd>
|
||||
Most backend libraries are protected by the GNU General Public License (see file <a
|
||||
href="COPYING">COPYING</a>), but as an exception, it is permissible to link against such a
|
||||
library without affecting the licensing status of the program that uses the libraries.
|
||||
For details, see the copyright notice at the head of the backend files (e.g., <a
|
||||
href="dll.c">backend/dll.c</a>).<br>
|
||||
|
||||
Note that not all of the backends apply the exception and that some have additional
|
||||
licensing constraints. E.g., the DC210 backend uses JPG code that is licensed as
|
||||
described in <a href="README.djpeg">README.djpeg</a>.
|
||||
</dd>
|
||||
|
||||
<dt>
|
||||
The SANE API and network protocol as put forth in the standard document.
|
||||
</dt>
|
||||
<dd>
|
||||
The <a href="html/">standard</a> is considered to be in the public domain. Anyone is
|
||||
free to implement SANE interface conforming applications or libraries in any way he or she
|
||||
sees fit.
|
||||
</dd>
|
||||
</dl>
|
||||
</blockquote>
|
||||
|
||||
<hr>
|
||||
|
||||
<p>
|
||||
<a href="/">SANE homepage</a><br>
|
||||
<a href="imprint.html">Contact</a>
|
||||
</p>
|
||||
|
||||
<p>
|
||||
<font size="-1">$Date$ $Author$</font>
|
||||
</p>
|
||||
</body>
|
||||
|
||||
</html>
|
||||
Ładowanie…
Reference in New Issue