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Optimum Spectral Sensitivities for a Reversible Color Film Process

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Abstract

A method was developed for theoretical evaluation of spectral sensitivity functions to be used with a specified set of subtractive primary dyes in a reversible color process. Using a numerical calculus of variations procedure, hypothetical blue, green, and red sensitivities were varied in a systematic way to obtain the curves which minimize the errors of color reproduction. These three optimum sensitivities were found to be non-overlapping and to have maxima at 450, 540, and 630 mμ, respectively. As an illustration of the application of the method to the evaluation of experimental sensitizers, color renditions are calculated for two sets of sensitivity functions which are alike in the blue and green, but different in the red. The two combinations of sensitivities are compared and conclusions are drawn regarding changes of the curves which would yield specific improvements in color reproduction.

© 1947 Optical Society of America

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