>> So much of image (and audio!) processing is about getting away with noise the person can't detect For example, if you see what looks like blurry skin, and y

>> So much of image (and audio!) processing is about getting away with noise the person can't detect For example, if you see what looks like blurry skin, and you de-blur it into skin, no-one will complain. Unless your de-blur noise elimination thinks the blurry eyes are noise, and turns the subject into a faceless monster.