This tool is a simple command line application that reads two images and compares their content. It has a built-in degree of tolerance, so the images don't have to be identical pixel by pixel.
Run the command line executable:
ImageCompare testImage, baselineImage1, [baselineImage2, baselineImage3, ...]
Note that if you supply more than one baselineImage, this test will pass if any of them match the testImage. A executable return value of 0 indicates the images are the same. A non-zero return value indicates the images are different.