A simple script to recursively optimize every image(jpeg|gif|png) in a folder.

..OptimizeImages.md

This simple script will find every jpg, gif, and png in a directory recursively and optimize it using google's pagespeed recommended settings.

Depends on ImageMagick's convert plugin. Pass folder to optimize as first parameter.

optimizeImages.sh

#!/bin/bash

if (( $# != 1 ))
    then
        echo "Script requires exactly one argument, which is a valid path to optimize."
        exit 1;
else
    if [ ! -d $1 ]; then
        echo "Directory must exist!."
        exit 1;
    fi
fi

echo "Optimizing JPG images now..."
find $1 -name "*.jpg" -print0 | while IFS= read -r -d '' file
do
  if [ ! -z "$file" ]; then
    convert "$file" -sampling-factor 4:2:0 -quality 85 -strip -interlace JPEG -alpha Remove "$file.test"
    FILESIZE=$(stat -c%s "$file")
    FILESIZEM=$(stat -c%s "$file.test")

    while (( FILESIZEM < FILESIZE ))
    do
      echo "Optimized image $file Before: $FILESIZE, After: $FILESIZEM"
      cp "$file.test" "$file"
      convert "$file" -sampling-factor 4:2:0 -quality 85 -strip -interlace JPEG -alpha Remove "$file.test"
      FILESIZE=$(stat -c%s "$file")
      FILESIZEM=$(stat -c%s "$file.test")
    done
    rm "$file.test"
  fi
done

echo "Optimizing GIF images now..."
find $1 -name "*.gif" -print0 | while IFS= read -r -d '' file
do
  if [ ! -z "$file" ]; then
    convert "$file" -strip -alpha Remove "$file.test"
    FILESIZE=$(stat -c%s "$file")
    FILESIZEM=$(stat -c%s "$file.test")
    if (( FILESIZEM < FILESIZE )); then
      echo "Optimized image $file Before: $FILESIZE, After: $FILESIZEM"
      cp "$file.test" "$file"
    fi
    rm "$file.test"
  fi
done

echo "Optimizing PNG images now..."
find $1 -name "*.png" -print0 | while IFS= read -r -d '' file
do
  if [ ! -z "$file" ]; then
    convert "$file" -strip -alpha Remove "$file.test"
    FILESIZE=$(stat -c%s "$file")
    FILESIZEM=$(stat -c%s "$file.test")
    if (( FILESIZEM < FILESIZE )); then
      echo "Optimized image $file Before: $FILESIZE, After: $FILESIZEM"
      cp "$file.test" "$file"
    fi
    rm "$file.test"
  fi
done