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gif2png (version 0.6 beta)
Copyright (C) 1995 Alexander Lehmann
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications (see below), and to alter it and
redistribute it freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
4. Binary only distributions of the software must include the file README
with the copyright statement. You are welcome to add a copyright
statement for your modifications and a contact address, though.
Note that this program uses the LZW decompression algorithm, which due to
patent claims probably requires you to license if you use the algorithm
in a commercial program or distribute this program on a for-profit basis.
(See http://www.unisys.com)
Part of this program (gifread.c) carries the following copyright:
/* +-------------------------------------------------------------------+ */
/* | Copyright 1990 - 1994, David Koblas. (koblas@netcom.com) | */
/* | Permission to use, copy, modify, and distribute this software | */
/* | and its documentation for any purpose and without fee is hereby | */
/* | granted, provided that the above copyright notice appear in all | */
/* | copies and that both that copyright notice and this permission | */
/* | notice appear in supporting documentation. This software is | */
/* | provided "as is" without express or implied warranty. | */
/* +-------------------------------------------------------------------+ */
(This file was taken from the Moasic 2.5 distribution, so another copyright
may apply, but I haven't received any reply from NCSA yet)
Part of the program (437_l1.c) was generated by trans100 written by Kosta
Kostis <kosta@live.robin.de>.
This package (great source for character conversion tables) is available as
ftp://ftp.uni-erlangen.de:pub/doc/ISO/charsets/transXXX.tar.gz, where XXX is
replaced by a version number.
The png sample library is Copyright (c) 1995 Guy Eric Schalnat, Group 42, Inc.
and is available from ftp://ftp.uu.net/graphics/png/src/libpng*.zip
The zlib compression library is Copyright (C) 1995 Jean-loup Gailly and Mark
Adler and is available from ftp://ftp.uu.net/graphics/png/src/zlib-*.tar.gz
The PNG specification is Copyright 1995, Thomas Boutell and is available
from ftp://ftp.uu.net/graphics/png/documents. Obviously without the PNG effort
this program wouldn't have been possible (or even conceivable).
The Graphics Interchange Format(c) is the Copyright property of
CompuServe Incorporated. GIF(sm) is a Service Mark property of
CompuServe Incorporated.
The GIF spec is available from any SimTel mirror as msdos/gif/gif89a.zip,
e.g. on ftp://oak.oakland.edu/SimTel
OK, now that we got this ground covered, we switch to more `normal' tone:
If you are reading this, you have received gif2png either in source or
precompiled binary form. If you want to compile the program yourself, see
the file COMPILING. If you have received the program is precompiled form,
the source code is available from
ftp://ftp.uu.net/graphics/png/applications/gif2png*.zip
Note that this program is considered a beta version, it has performed
satisfactory for me and is fairly complete, though there may be a few bits
missing. However, with the diversity of computer systems out there, you
may run into problems both when compiling and running the program.
If you are converting your GIF collection, you should take care to verify
that the conversion was successful with any PNG reading program, e.g. QPV.
The delete option is currently disabled.
The usage of the program is as follows:
gif2png [ -dhi ] [file[.gif]] ...
-d delete source GIF files after successful conversion
-i create interlaced PNG files
-h create histogram chunks for color files
-p display progress of PNG writing in %
-r try to recover corrupt GIF files
-s do not write Software chunk
-t ignore Plain Text Extensions
if no source files are listed, stdin is converted to noname.png
(may not work on systems that distinguish between text and binary mode)
The program will try to preserve the information contained in a GIF file as
close as possible, including comments, application data. Plain text extensions
are currently not supported, however this will probably be fixed in a future
version of the program. If a multi-image GIF is encountered, multiple PNG
files are created, names file.png, file.p01, file.p02 etc.
Alexander Lehmann <alex@hal.rhein-main.de>
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