Apparatus for ascertaining color balance of photographic printin

Details Apparatus for ascertaining color balance of photographic printin Apparatus for ascertaining color balance of photographic printin

1979-02-16

1981-03-24

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 32, 355 72, G03B 2772

Patent

active

042577020

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: 2441919 (1948-05-01), Lockrey et al.
patent: 3737224 (1973-06-01), Culler
patent: 3748045 (1973-07-01), Mitchell
patent: 3901598 (1975-08-01), Vanheerentals

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