Scanned, rekeyed, any blatantly noticeable visible errors corrected. That's about it. It's not a directly analogy to sound engineering as usually these days the studios and mastering engineers can't help but compressing the dynamic range even more than the original master (see: loudness war).
Originally Posted by pentaxuser
Stop worrying about grain, resolution, sharpness, and everything else that doesn't have a damn thing to do with substance.