Java program to compare two images.
Has several options:
getPixelDiffCount
Will return an absolute pixel difference count between the two images.
getPixelDiffPercent
Will return the percentage difference in the number of pixels.
getWidthDiff
Will return the difference in the width of the images in pixels.
getWidthDiff
Will return the difference in the height of the images in pixels.
createCompositeImage
Will create a composite image with pixels that are different highlighted in red.