Compare two images in Monkeyrunner under windows

I am trying to compare two images that are taken from monkeyrunner. I found that there is sameAs in monkeyrunner but it seems to not work. There are two other ways, one is install package ImageMagick, but I don't know how to install and use it under windows, the useful information just could be used in Linux system. Another way is using ImageChop of PIL library of Python. I just want to check the开发者_开发百科 images are the same or not. Is there another way to check how many percentage that the images are different?

I would use PhotoShop. Put 2 images in 2 layers, make "Difference" blending, and you may see difference in pixels visually, or when you choose Histogram from menu. Histogram values shown as zeros mean identical images.

PShop layers:

Histogram:

Visual difference (may be harder to spot)

This test is from image loaded in RGB 888 pixel format vs RGB 565 pixel format, so there's slight difference in result.