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Method and device for determining the color appearance of color overprints

  • US 5,933,578 A
  • Filed: 04/08/1997
  • Issued: 08/03/1999
  • Est. Priority Date: 04/08/1997
  • Status: Expired due to Term
First Claim
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1. A method for determining respective sets of np parameters that spectrally characterize one or more colorants in order to predict the color of an overprint of the colorants printed in an order of printing at a set of respective coverage percentages on a substrate of a substrate type using a printing technique, each of the colorants defined by a respective recipe of one or more basic colorants, the method comprising, for a particular colorant of the colorants:

  • (a) for each basic colorant of the respective recipe defining the particular colorant;

    (i) making a selected number of sets of prints of the basic colorant on said selected number of respective substrates of the same substrate type, a set of prints comprising prints of the basic colorant on the respective substrate at a range of coverage percentages of interest, the selected number of prints at any particular coverage percentage being on backgrounds of said selected number of different background colors, said selected number dependent on np ;

    (ii) measuring the spectra of the prints of the selected number of sets of prints and the spectra of each of the different background colors; and

    (b) determining from the recipe and from the measured spectra, the set of np colorant parameters of the particular colorant as a function of the coverage percentage and of wavelength, the colorant parameters substantially independent of the color of the substrate.

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