If there's no way to prove that semantic processing was used then the rule is unenforceable so you might as well permit it. Cropping the photograph is indisting

If there's no way to prove that semantic processing was used then the rule is unenforceable so you might as well permit it. Cropping the photograph is indistinguishable from using a different camera, and changing the focus is indistinguishable from getting the focus right by accident. Cropping and focus can both be used deceptively, but it's a different type of deception from selective editing of an image, e.g. changing somebody's skin texture.