Method of detecting negative film frame which need not be printe

Details Method of detecting negative film frame which need not be printe Method of detecting negative film frame which need not be printe

1987-03-27

1988-01-12

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Methods

355 32, 355 41, G03B 2732

Patent

active

047194944

ABSTRACT:
A method of making a judgement as to whether or not a negative film frame needs to be printed on a photographic sheet of paper is employed using for the judgement the photographic density of the image on the frame. According to the method, a negative film frame is divided into a multiplicity of small regions, and photographic density values are measured at the small regions. It is judged that a negative film frame need not be printed when a minimum value of the photographic densities measured in relation to any portion or the whole of the frame, or a value which is higher than the minimum value by a predetermined degree, is larger than another specific value.

REFERENCES:
patent: 4492458 (1985-01-01), Bickl et al.
patent: 4523839 (1985-06-01), Payrhammer et al.
patent: 4542984 (1985-09-01), Shiota et al.

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