Method and apparatus for evaluating developed photographic films prior to copying

US4152068A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Horst Bickl · Pullach, DE
• Gunter Findeis · Sauerlach, DE
• Helmut Treiber · Munich, DE
• Wolfgang Zahn

Key dates

• Filing date: Nov 8, 1976
• Grant date: May 1, 1979
• Expiry date: Nov 8, 1996

Classification

• Technology area (CPC G): Physics
• CPC primary: G03B27/73
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Successive frames of a web of photographic color film are subjected to objective examination during transport through an automatic evaluating circuit which may constitute a discrete prereader or a prereader which is integrated into a copying machine upstream of the copying station. The prereader furnishes signals which represent color and/or density correction data for reproduction of those film frames which can be properly copied only with a setting of exposure controls which deviates from the average setting for copying of the majority of film frames. The objective examination of all film frames is followed by a subjective examination which is performed by an attendant who inspects at least some of those film frames whose examination by the prereader resulted in the generation of correction signals. The attendant inspects the film frames at the copying station or at a second station which is located immediately downstream of a discrete prereader, and the attendant simultaneously observes the corresponding correction signals which are furnished by the evaluating circuit and are displayed close to the copying station or in register with film frames at the second station. The attend…