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README.txt
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README.txt
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Portable Network Graphics Downsampler is a tool which allows downsizing of PNG
images without loading the entire file in memory. This makes it possible to
resize extremely large PNGs.
== Installation ==
# svn co http://svn.wikimedia.org/svnroot/mediawiki/trunk/pngds
# cd pngds && make
== Windows installation ==
pngds can be compiled using mingw as well as with the Microsft Visual C
compiler. Microsoft Visual C++ 9.0 project files can be downloaded from
<http://toolserver.org/~bryan/pngds/>
== Precompiled binaries ==
Precompiled binaries for Linux and Windows can be downloaded from
<http://toolserver.org/~bryan/pngds/>
== Usage ==
pngds [--from-stdin] [--to-stdout] [<source>] [<target>]
[--width <width>] [--height <height>] [--no-filtering] [-n]
--from-stdin Read data from stdin instead from <source>
--to-stdout Output data to stdout instead to <target>
--width Resize width
--height Resize height
If only one of width or height is specified,
the image is resized keeping aspect ratio.
--no-filtering Disable Paeth filtering (faster)
-n Compression level from 0-9 (-0 .. -9)
== License ==
Copyright (C) 2008 Bryan Tong Minh
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA