Translator for measuring amount of color correction for color

Details Translator for measuring amount of color correction for color Translator for measuring amount of color correction for color

1975-01-23

1976-04-13

Corbin, John K.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

355 38, 356178, G01J 350

Patent

active

RE0287717

ABSTRACT:
A translator comprising a light receiving unit including three kinds of photocells having spectral sensitivities to red, green and blue colors respectively for receiving light from the optical projecting system of an enlarger equipped with color correction filters, arithmetic units for calculating ratios between the outputs of the photocells by taking one of the outputs as denominators and the other two outputs as numerators respectively, comparison output setting units having their outputs determined only by the conditions of a negative previously memorized for comparison with the outputs from the arithmetic units respectively, and comparison units for comparing the outputs from the arithmetic units with the corresponding comparison outputs individually to indicate the differences therebetween, whereby the amount of color correction given only by the conditions of the negative is adjusted for the enlarger actually used for color printing.

REFERENCES:
patent: 3527540 (1970-09-01), Bowker et al.
patent: 3612683 (1971-10-01), Riley et al.
patent: 3697174 (1972-10-01), McCune

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