A simple script which applies non-destructive optimization algorithms on png and jpg files in order to adjust size vs quality. It proceeds every file in a directory. Linux only. It can easily be added in Nautilus through Nautilus-Actions.

Image optimize

#!/bin/bash

# Required commands :
# - optipng
# - jpegoptim

# optipng (non destructive)
optipng *.png
optipng *.PNG

# optimize JPG (non-destructive)
jpegoptim *.jpg
jpegoptim *.JPG
jpegoptim *.jpeg
jpegoptim *.JPEG