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 selectively to 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 absorptions for red, green, and blue light by each of the dye images. The relative absorptions are arrayed in the form of 3.times.3 mathematical matrices. Solving the matrices in several permutations allows the comparison of actual dye densities that form any one of a number of standard colors with the dye densities that form the image of a test print.

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.

Abstract: The color balance of photographic printing paper is determined by making three successive exposures of the same portion of a sample sheet of photographic color printing paper. Two of the exposures are made through a neutral-color optical wedge of linear density gradient. The third exposure is not made through the wedge. Each exposure consists essentially of a different primary color of light of predetermined intensity and duration selectively to stimulate each of the three color-sensitive emulsion layers in the printing paper. The composite image produced upon development provides a means for visually matching a known color standard such as a neutral gray card to a definite small area of the print produced. The position of the discovered matching area of the print relative to a central point of the composite print, such central point being automatically demarcated in the procedure, provides a direct correction to the trial color analyzer printing program to produce a fully corrected printing program.

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.

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.