Calculating the spectral characteristics of the color resulting from overlaying colorants
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United States of America Patent
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May 24, 2016
Grant Date -
Oct 31, 2013
app pub date -
Apr 25, 2013
filing date -
Apr 27, 2012
priority date (Note) -
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Abstract
A method of spectrally characterising an ink printed over another ink, and of calculating a spectral measure of reflectance of an overprint of a plurality of inks thus characterized. The method uses spectral measurements of a substrate. For an order of printing an overprint, for each ink, for a respective amount of printing of the ink, the method accepts or determines a respective interaction of absorption and reflection function (“IAR function”) indicative of how the ink interacts with a printed background and includes determining the spectral reflectance by repeatedly multiplying, in the order, for each additional ink added to a current background the spectral measure of the current background by exponentiation of the ratio of the spectral measure of the additional ink on the substrate to the spectral measure of the substrate, by the TAR function of the additional ink.
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