Importance

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Abstract

A graphic arts film processor includes a scanner which measures the transmittance of light through the film along a line or a set of parallel lines positioned at a skew angle A with respect to the direction of film travel. A film switch is located at the upstream end of the scanner. The film width is determined based upon the skew angle A, the film transport speed and time intervals between changes in the signals from the scanner and the film switch which correspond to the leading and trailing ends of the film. The film length is determined based upon the transport speed and a time interval between changes in the signal from the film switch corresponding to the leading and trailing ends. Developer replenishment is controlled based upon an integrated transmittance complement measured by the scanner, and fix replenishment is controlled as a function of the film length, the film width, and the integrated transmittance complement.

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First Claim