Included in Debian stable:
http://packages.debian.org/optipng
Jari
sdesc: Advanced PNG (Portable Network Graphics) optimizer
ldesc: A PNG optimizer that recompresses the image files to a smaller size.
It losslessly reduces the bit depth, the color type and the color
palette of the image, runs a suite of compression methods and
strategies, and selects the compression parameters that yield the
smallest output file. It also recognizes several external file formats
like BMP, GIF, TIFF and PNM (PBM, PGM, PPM).
category: Utils
requires: cygwin libpng12 zlib
a) manual
mkdir optipng
cd optipng
wget\
http://cygwin.cante.net/optipng/optipng-0.5.5-1-src.tar.bz2 \
http://cygwin.cante.net/optipng/optipng-0.5.5-1.tar.bz2 \
http://cygwin.cante.net/optipng/setup.hint
tar -xf optipng-0.5.5-1-src.tar.bz2
./optipng*.sh --color all
b) automated
gpg --keyserver pool.sks-keyservers.net --recv-keys 955A92D8
mkdir optipng ; cd optipng
rm -f get.sh get.sh.sig
wgethttp://cygwin.cante.net/optipng/get.sh \
http://cygwin.cante.net/optipng/get.sh.sig
gpg --verify get.sh.sig get.sh
sh get.sh
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