Abstract

The method used in the design of a printed reproduction of the spectrum of white light is described. This differs from most previous reproductions in that the relative saturation and darkness of the spectral colors were taken into account. The method was (1) the saturations and darknesses of the spectral colors and of the colors of maximum saturation that can be produced by the printing inks were calculated; (2) the desired darkness and saturation curves, representing a compromise between the spectral colors and the ink colors, were drawn; (3) the dot areas required to produce the desired colors were computed by means of modified Neugebauer halftone equations; (4) the exposure distribution required for the continuous-tone positives was calculated, taking into account the tone-reproduction characteristics of the process; (5) a set of templates was made to produce the required exposure distribution; (6) the positives were exposed by means of these templates; (7) halftone negatives were made from the positives; (8) offset printing plates were made from hard-dot duplicates of these.

© 1975 Optical Society of America

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