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How to compare images

Beyond Compare can open image files:
Differences in red: extra salt and a missing Morton trademark
Caveat: If the images are different sizes Beyond Compare will not stretch or resize them for you. It is meant as a pixel comparison, so resizing wouldn't really make sense anyway.

To get started:

Drag two images into Beyond Compare. If the filenames end in .jpg, .gif, .tiff, or similar the software will detect the file extension and open them in a Picture Compare session.
The first two controls you should start with are (1) press the Tol (tolerance) button and then play with the tolerance slider.
(2) Flip rapidly between Image A and Image B by hitting the F8 key in Windows or with your mouse: