Hello!  I'm about to start a project/game involving image comparison, and was interested if I could get some help in the form of basic code structure.

I want to give the computer two images and I'd like it to tell me how much % they match.

Would I go pixel by pixel through both of the images, and then compare HSV, return some % correct, and then do a gigantic average of all of the %s?

Any ideas?  Any structural help like how many and what kind of arrays I should use?

Thank you!