In linear photographic masking theory it is assumed that the cyan, magenta, and yellow dyes in the processed film are deposited in amounts which are linear functions of the logarithm of each of the red, green, and blue exposures. Metameric pairs of colors will be reproduced alike in the photographic process only if the spectral sensitivities of the red-, green-, and blue-exposure emulsions conform to a set of visual color-mixture curves. Optimum colorimetric reproduction is obtained through utilization of the combination of color-mixture curves and photographic masks, relating dye amounts to exposure, which minimize colorimetric reproduction errors.
It is shown that significant changes in the choice of color-mixture curves may be largely compensated for by corresponding changes in the masks. Optimum choices of masks depend in part upon the gamut of colors to be reproduced. Emulsion spectral sensitivities departing from color-mixture curves may also yield essentially equivalent colorimetric reproduction provided that the masks are suitably chosen.
© 1955 Optical Society of AmericaFull Article | PDF Article
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