Method for controlling a photographic printing exposure

Details Method for controlling a photographic printing exposure Method for controlling a photographic printing exposure

1976-08-18

1978-07-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

356202, G01N 2130

Patent

active

041004248

ABSTRACT:
A method is disclosed for controlling the exposure during photographic printing. The transmission density of a negative or original is measured to provide an exposure control signal. In an illustrative embodiment of this invention, the original is divided into a central portion, a peripheral portion, an upper portion, a lower portion, a right-hand portion and a left-hand portion. Means are provided for quantizing a difference in average density between the portions in the negative, which is classified into a plurality of categories in accordance with a logic of combining characteristic values of the negative. The method affords an enhancement of accuracy in exposure control and an enhancement of probability of obtaining prints of good quality.

REFERENCES:
patent: 3690765 (1972-09-01), Rickard et al.
patent: 3708676 (1973-01-01), Huboi et al.
patent: 3790275 (1974-02-01), Huboi et al.
patent: 4001594 (1977-01-01), Akimoto et al.

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