Optics: measuring and testing – By shade or color – Photography
Patent
1977-07-05
1979-09-04
Corbin, John K.
Optics: measuring and testing
By shade or color
Photography
355 35, 355 72, G01J 346, G03B 2704
Patent
active
041667018
ABSTRACT:
The color balance of color photographic printing paper is determined by making three successive exposures of separate portions of a sample sheet of printing paper through a neutral-color optical wedge of linear density gradient, each exposure consisting essentially of a different primary color of light of predetermined intensity and duration to selectively stimulate each of the three color-sensitive emulsion layers in the printing paper. The three images produced upon development provide a means for objective quantitative measurement of the relative responsiveness of each of the emulsion layers using a reflection densitometer to locate points of equal optical density, the relative linear displacement of the points providing color-balance correction factors. An easel is provided with a sliding carriage for positioning the sample sheet of printing paper in proper relationship to the optical wedge, which is fixed in place in an aperture in a light-proof cover. A device for calculating the correction factors from the printed images of the optical wedge is equipped with sliding scale members calibrated for measuring displacement in appropriate units for making color-balance corrections.
REFERENCES:
patent: 3685900 (1972-08-01), Kirby et al.
Arnold Bruce Y.
Corbin John K.
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