Guetzli JPG/JPEG Optimizer – This little script compresses JPG-files and shows you how many bytes Guetzli saved.

guetzli-optimizer.sh

#!/bin/bash
#
#   Guetzli JPG/JPEG Optimizer
#   This little script compresses JPG-files and shows you how
#   many bytes Guetzli saved you in the progress. Change the
#   variable QUALITY to change the quality of the compression.
#
clear
QUALITY=85

echo -e "\nGuetzli starts compression with quality ${QUALITY}…\n"
for i in *.jpg;
do
  cwebp -quiet -q 90 $i -o "${i%.*}.webp"
  new_size=$(stat -f%z $i)
  echo -e "\033[32mGenerate WEBP \033[33m› New size $new_size bytes – Saved bytes $(( ${old_size}-${new_size} ))"
  old_size=$(stat -f%z $i)
  echo -e "\033[32mMake copy for savety \033[1;32m$i \033[0;32moriginal-$i – \033[37mCopying…"
  cp $i original-$i;
  echo -e "\033[32mActual size of \033[1;32m$i \033[0;32m$old_size bytes – \033[37mGuetzli is working…"
  guetzli --quality $QUALITY $i $i
  new_size=$(stat -f%z $i)
  echo -e "\033[33mGuetzli JPG › New size $new_size bytes – Saved bytes $(( ${old_size}-${new_size} ))"
  echo -e "\033[0m"
done

for i in *.png; do cwebp -quiet -q 90 $i -o "${i%.*}.webp"; done