Patent ID: 8593690

Claim:
A method for making the overprint prediction for a color combination, wherein a printing substrate and at least two printing colors and one gradation of hue values including full tone for each printing color as well as color combinations are predefined as data of the hue value of each of the n printing colors, comprising: a) firstly, determining individual color predictions comprising three transmittance components and the associated transmittance spectra for the respective hue value for each of the n printing colors, the three transmittance components are: as a first component light rays being reflected on the printing substrate without passing through a printing field; as a second component light rays being reflected on the printing substrate with a single passage through a printing field; and as a third component light rays being reflected on the printing substrate with a double passage through a printing field; b) determining, for an intended color combination up to (3 to the power of n) combinations of the transmittance components and the associated combined transmittance spectra, and c) predicting an overall reflectance spectrum of an overprint on the basis of the determined transmittance components with their transmittance spectra and the reflectance spectrum of the unprinted substrate.