Method of correcting color image data for obtaining proof image

Abstract

Printable color image data (Y, M, C and K) is subjected, in a first processor (S.sub.1), to a first correction procedure to compensate the same for a first additivity failure which results from the mixing of primary chromatic components (Y, M, and C). The color image data is thereafter subjected, in a second processor (S.sub.2), to a second correction procedure involving compensation for a second additivity failure caused by mixture of primary chromatic components (Y, M and C) with an achromatic component (K). Thereby, color image data (Y.sub.5, M.sub.5 and C.sub.5) is obtained from which a color film approximating the colors that will appear in an ink-based printed reproduction of an original image is obtained. Conversion functions for providing the necessary compensation for the two additivity failures are defined/obtained on the basis of actual densities of a printed version of the color image data and a color film version thereof.