image-comparison.sh

#!/bin/bash

# This script requires ImageMagick and Ghostscript

mkdir -p comparison
cd comparison
rm *

http --download "$1"

pattern="*.jpg"
files=( $pattern )
original="${files[0]}"
echo $original
# Create encodings

for q in high veryhigh
do
  jpeg-recompress --strip -a -m ssim -q $q $original $q-ssim.jpg
  jpeg-recompress --strip -a -m mpe -q $q $original $q-mpe.jpg
done

# Annotate images
for f in *.jpg
do
  convert $f -gravity northwest -pointsize 20 -annotate +0+2 "\(`du -k $f | python2 -c 'kb = raw_input().split()[0]; print(kb + " KB")'`\) `identify -verbose $f|grep Quality` - $f" crop-${f}.png
done

# Create montage
dest="../comparison-$original.png"
rm $dest
convert crop-$original.png crop-veryhigh-mpe.jpg.png crop-veryhigh-ssim.jpg.png crop-high-mpe.jpg.png crop-high-ssim.jpg.png -append $dest
echo "done"
cd ..