Method and apparatus for ascertaining color balance of photograp

Details Method and apparatus for ascertaining color balance of photograp Method and apparatus for ascertaining color balance of photograp

1982-05-26

1985-01-08

Evans, F. L.

Optics: measuring and testing

By shade or color

Photography

355 32, 355 77, G01J 346

Patent

active

044924747

ABSTRACT:
The color balance of photographic printing paper is determined by exposing one frame of the roll of negative film from which prints subsequently will be made with an image preferably from an especially prepared target-card. After processing, the negative or positive of the target-card exposure is printed on the paper being tested using a white-light exposure of known filtration, which is likely to be within correctable reach of the optimal filtration. The target-card bears a grid of superimposed lines which is used to measure the required filtration correction. The position of a desired neutral gray spot on the test print, which is the end-point of color balance determination, is found by matching against a standard paper gray scale.

REFERENCES:
patent: 3748045 (1973-07-01), Mitchell

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