Lossless image compression for all images in current directory

image-minifier.sh

#!/bin/bash
# Minify all jpg and png images in current directory recursively
command_exists () {
    type "$1" &> /dev/null ;
}

# Learn more about optipng at http://sweetme.at/2013/09/11/how-to-maximize-png-image-compression-with-optipng/
if command_exists optipng ; then
  optipng -o2 -strip all **/*.png
else
  echo 'Error: optipng is not installed. If you are on a Mac, we recommend googling "homebrew Mac" and installing via brew' >&2
  exit 1
fi

# Learn more about jpegoptim at https://guides.wp-bullet.com/batch-compress-jpeg-images-lossless-linux-command-line/
if command_exists jpegoptim ; then
  jpegoptim --strip-all **/*.{jpg,jpeg}
else
  echo 'Error: jpegoptim is not installed. If you are on a Mac, we recommend googling "homebrew Mac" and installing via brew' >&2
  exit 1
fi