pngstrip (using pngcrush)

pngstrip.sh

#!/bin/bash
 
echo " "
shopt -s nullglob
for file in ./*.png; do
    echo "Working on $file"
    pngcrush -q -rem gAMA -rem cHRM -rem iCCP -rem sRGB $file "$file.tmp"
    mv $file "$file.old"
    mv "$file.tmp" $file
done
echo " "
echo "Complete."
echo " "
 
# Remove old files
rm -rf *.png.old