Diff PNG files between two folders and list out the images that are different using ImageMagick

diff.sh

#!/bin/bash

files=`find $1/*.png`

while read -r srcfile; do
    name=`basename $srcfile`
    targetfile="${2}/${name}"
    result=`compare -metric RMSE $srcfile $targetfile /dev/null 2>&1;`
    if [[ $result != 0* ]]; then
      echo "${name} = ${result}"
    fi
done <<< "$files"

exit 0