Image optimization for web

install_package.sh

sudo apt-get install libjpeg-progs pngcrush

pngcrush.sh

#!/bin/sh

# script for optimizing images in a directory (recursive)
# pngcrush & jpegtran settings from:
# http://developer.yahoo.com/performance/rules.html#opt_images

# pngcrush
for png in `find $1 -iname "*.png"`; do
    echo "crushing $png ..."
        pngcrush -rem alla -reduce -brute "$png" temp.png

            # preserve original on error
                if [ $? = 0 ]; then
                        mv -f temp.png $png
                            else
                                    rm temp.png
                                        fi
                                        done

                                        # jpegtran
                                        for jpg in `find $1 -iname "*.jpg"`; do
                                            echo "crushing $jpg ..."
                                                jpegtran -copy none -optimize -perfect "$jpg" > temp.jpg

                                                    # preserve original on error
                                                        if [ $? = 0 ]; then
                                                                mv -f temp.jpg $jpg
                                                                    else
                                                                            rm temp.jpg
                                                                                fi
                                                                                done