PNG Compression

I use the following two tools:

• AdvanceCOMP http://advancemame.sourceforge.net/comp-readme.html
• OptiPNG http://optipng.sourceforge.net/

I run the following code in each graphics directory:

advpng -z4 *.png
optipng -o7 *.png

See horde/framework/devtools/horde-compress-pngs.php http://cvs.horde.org/framework/devtools/horde-compress-pngs.php.