jpegoptim → ImageOptim or ImageAlpha → ImageOptim を拡張子にわけてショートカットを割り当てて手軽にできる
for f in "$@"
do
[ `basename "$f" .png` = `basename "$f"` ] || {
/Applications/ImageAlpha.app/Contents/Resources/pngquant --speed 3 --force --ext .png 256 "$f"; open -a imageoptim "$f"
}
[ `basename "$f" .jpg` = `basename "$f"` ] || {
/usr/local/bin/jpegoptim --strip-all --max=40 "$f"; open -a imageoptim "$f"
}
done