How can someone tell with absolute certainty whether or not a picture has been morphed? I'm not talking about a subjective reaction of incredulity, i.e. "I've never seen one THAT big -- it HAS to be a morph!". I'm talking about technical giveaways within a picture. We all know that computer pictures are comprised of pixels and that compressed pictures have artifacts, so there has to be something more to it than "pixels" or "compression artifacts".