Densitometer for photography

Details Densitometer for photography Densitometer for photography

1988-05-04

1990-03-06

Evans, F. L.

Optics: measuring and testing

By shade or color

Photography

356 73, 356406, 356418, G01J 351

Patent

active

049070363

ABSTRACT:
A densitometer for photography comprising a disk on which are disposed filters of three colors at predetermined circumferential spacing for measuring the transmission and reflection densities of negative and color reversal film and color print, and a visual sensitivity filter for measuring the reflection and transmission densities of monochromatic and monochromatic reversal film. Lamps and a light-receiving element are provided to enable measurment of the densities. The disks are rotatingly driven by a motor to bring seven filters into alignment with the light-receiving element. Density from the output of the light-receiving element is measured and compared to a reference density, and an exposure time correction factor is computed from the density differences and resulting color and density correction values. The correction values and factor are displayed and the data is externally output via an interface.

REFERENCES:
patent: 3102202 (1963-08-01), Sweet
patent: 4082458 (1978-04-01), Fukui et al.
patent: 4645350 (1987-02-01), Weidmann et al.

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