I want to compare a source png file to a compressed file.
I am using
imagemagick and this command:
convert image1 image2 -compose Difference -composite \ -colorspace gray -format '%[fx:mean*100]' info:
But what I get is a very odd number. I am looking from a number from 0-100%.
When I compared two totally different images I still get a 8.37885.
So good people of Ask Ubuntu, can you provide me with a command that will measure the difference between files properly and give me a number from 0-100?