Abstract

A number of theoretical treatments of the problem of three-color subtractive photographic reproduction have led to equations which express the required relationship between the amounts of the three dyes occurring in the reproduction and the red-, green-, and blue-exposure densities of the subject photographed. “Exposure densities” were defined by Brewer, Hanson, and Horton, as the densities of a particular object being photographed, measured with respect to the sensitivity distributions of the photographic process. Each dye must be a function of all three exposure densities. Subtractive color photographic processes, in which no masking is used, are frequently assumed to produce a cyan-dye image as a function of red-exposure density, a magenta image as a function of green-exposure density, and a yellow image as a function of blue-exposure density. However, many processes have “interimage effects” which cause each dye image to be a function of all three exposure densities. Some of the interimage effects occurring in Kodak Ektachrome Sheet Film have been determined. The sensitometric characteristics of the film, including the interimage effects, have been expressed in the form of equations similar to the theoretical color reproduction equations. A comparison of these two sets of equations indicates that most of the interimage effects occurring should give an improvement in color reproduction over that which would be obtained in their absence.

© 1952 Optical Society of America

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Equations (4)

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