Optimize images in folder ( Magento optimize image) jpegoptim and optipng

jpegoptim

sudo apt-get install jpegoptim
sudo apt-get install optipng 

find /path/to/magento/ -iname '*.jpg' -exec jpegoptim --strip-all -p {} \; -exec chmod 755 {} \; -exec chown www-data:www-data {} \;
find . -iname '*.png' -exec optipng -o7 -preserve {} \; -exec chown www-data:www-data {} \;