1. Make sure that pngcrush.exe is in a folder which is mentioned in the PATH directory reference, so it can be used from the command line.

2. Open folder containing PNGs you want to crush.

3. shift + right click in empty space in folder, “open command window in folder”

4. type “pngcrush -d “crushed” *.png

5. close command window and go to newly created ‘crushed’ folder, which now contains your optimised PNGs.

1. Create a folder for executables which will go into your PATH directory reference.
2. Open folder containing PNGs you want to crush
3. shift + right click in empty space in folder, “open command window in folder”
4. type “pngcrush -d “crushed” *.png
5. close command window and go to newly created ‘crushed’ folder, which now contains your optimised PNGs.

http://www.ragingsloth.com/softwareEng/PNGOptimizerIndex.html

a great feature is that you can simply drag/ drop images, and it will ‘smash’ them,a nd overwrite the original files on the fly.

for example, pull your entire website to a local folder, search for *.png in win explorer, then simply drag/ drop the query results into pnggauntlet, making sure to check the ‘overwrite original files’ box, and let it smash down the file size.

i just tested this workflow on a massive ecommerce website (about 2700 png’s worth about 40mb) and saved a whopping 3mb. of course, who knows how well the originals were optimized, but nonetheless, it’s a great result.

another great feature is that it can optionally convert from jpg, tiff, gif and bmp to png.

scriptname [-d directoryname]

[code]
#!/bin/sh
#
dflag=
while getopts 'd:' OPTION
do
case $OPTION in
d) dflag=$OPTARG
;;
?) printf "Usage: %s: [-d directory]\n" $(basename $0) >&2
exit 2
;;
esac
done
shift $(($OPTIND - 1))

if [ "$dflag" ]
then
# DO DIR PNGCRUSH
for png in `find $dflag -name "*.png"`;
do
echo "crushing $png"
pngcrush -brute "$png" temp.png
mv -f temp.png $png
done;
fi
[/code]

http://pornel.net/imageoptim/en