Image enhancement with luminance preserving is a false proposition and others

The “image enhancement with luminance preservation” is a self-conflict proposition. Researchers, including propositional proposer Kim, gave the index AMBE (absolute mean error) to judge if “luminance preserving”, however, which just proved that image preserving” cannot be realized. We have visual quality of an function average convex feature. enhanced preservation, and preserved being enhanced. perception not equal contrast. can experimentally prove what higher contrast image, better true.