Abstract: A method and apparatus for determining whether a predetermined cut position lies within an unexposed portion of a roll of film is provided. A first density sensor 20 senses film density of a roll of film (10) and produces film density data. The film density data is stored in a first data storage device (50). A second data storage device (52) reads and stores a film density data value indicative of the lowest value of the film density stored in the first data storage device (50) and outputs this as base density data. A second density sensor (22) senses the film density at a predetermined cut position and produces cut position density data. A counter (66) counts pulses produced by a film drive and, when a predetermined number of pulses has been counted, indicating the arrival of the film at the predetermined cut position, the counter (66) produces a control signal that causes a comparator (26) to compare the base density data to the cut position density data.