Photometric condition correcting method for photographic film

Details Photometric condition correcting method for photographic film Photometric condition correcting method for photographic film

1983-10-25

1986-03-25

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Methods

355 38, G03B 2732

Patent

active

045779619

ABSTRACT:
When printing a photographic film, it is necessary to determine exposure conditions by judging from the conditions of a picture image of an object. However, if the object is analyzed by photometrically measuring it at the developing stage of the negative film, it is impossible to discriminate whether the result of the analysis is attributable to the object per se or the fluctuation in film developing process. According to this invention, a film property printed portion is exposed at a predetermined location on a film beforehand for identification of the film properties, the portion being measured for the density at the time of printing, comparing the measured density with a standard value, correcting the photometrical conditions on both surfaces of the film.

REFERENCES:
patent: 4211558 (1980-07-01), Oguchi et al.
patent: 4274732 (1981-06-01), Thurm et al.
patent: 4335956 (1982-06-01), Findeis et al.
patent: 4464045 (1984-08-01), Findeis et al.

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