Interesting, I couldn't find a tool like this that would give me a useful % difference between images, so I rolled my own tiny python version using PIL: https:/

Interesting, I couldn't find a tool like this that would give me a useful % difference between images, so I rolled my own tiny python version using PIL: https://github.com/nicolashahn/python-image-diff https://github.com/nicolashahn/python-image-diff which gives both a diff image and the % difference.