A frame of photographic film is optoelectronically scanned after development to produce an electronic image which is analayzed to determine the exposure and development conditions of the film. Tone conversion signals are generated in accordance with the analyzed conditions to convert the tone characteristics...http://www.google.de/patents/US5060061?utm_source=gb-gplus-sharePatent US5060061 - Method of reading an image recorded in a photographic film tone characteristic correcting method in reproducing an image recorded in a photographic film
