Abstract

Two main types of black printer are described—(a) those in which the black printer is only used to increase maximum density; (b) those in which the total gray component of the reproduction is supplied by the black. For practical purposes, the black printer density should be a function of the lowest of the equivalent densities of the three image components when the latter are color-corrected to give an accurate three-color reproduction. Several theoretically possible but somewhat complicated methods of selecting the lowest of three densities are described. The use of infra-red radiation, which is the only previously known method of making a good black printer, is limited in its application, since it depends on accidental or artificially introduced relationships between visual and infra-red brightness. For accurate brightness rendering, the color-corrected three-color separations require further correction by means of a black printer mask.

© 1940 Optical Society of America

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J. Opt. Soc. Am. 39(11) 924-927 (1949)

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