Method for controlling the quantity of exposure in photographic

Details Method for controlling the quantity of exposure in photographic Method for controlling the quantity of exposure in photographic

1975-06-20

1977-01-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

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

250214AG, 356202, G01N 2130

Patent

active

040015947

ABSTRACT:
An improved method for controlling the quantity of exposure in photographic printing to obtain high-quality prints is disclosed. The method is carried out by photoelectrically detecting a plurality of optical densities from a principal portion of a negative film then discriminating the maximum value and the minimum value of the photoelectrically detected optical densities. The difference between the maximum and minimum values is calculated to achieve a first output, and the first output is non-linearly converted and combined with the maximum or minimum value output to achieve a third output for controlling the quantity of exposure. The method provides satisfactory prints even from those negative films having principal subject density failures or color failures.

REFERENCES:
patent: 3560757 (1969-07-01), Pugsley
patent: 3652791 (1972-03-01), Shuey
patent: 3690765 (1972-09-01), Richard et al.
patent: 3856413 (1974-12-01), Bey et al.

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