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Color tone control method for printing press

  • US 6,722,281 B2
  • Filed: 12/27/2002
  • Issued: 04/20/2004
  • Est. Priority Date: 12/27/2001
  • Status: Expired due to Fees
First Claim
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1. A color control method for a printing press to control printed color tone, wherein the printing press includes a first device to either electronically or mechanically vary an amount of ink dispensed for each ink color, and a second device to perform a multispectral measurement on a printed item produced by the printing press;

  • said method comprising steps of;

    (a) printing a plurality of test items while varying the amount of ink dispensed, for each ink color, during a test printing;

    (b) performing the multispectral measurement on the plurality of item test items which are printed during the test printing while varying the amount of ink dispensed;

    (c) determining a transfer function to calculate for each ink color the amount of ink dispensed as a function of changes in the multispectral measurement on the test items and a percentage dot area corresponding to each ink color; and

    (d) during commercial printing, utilizing the transfer function to compute, for each ink color, a change in the amount of ink dispensed based on a change in the multispectral measurement from target colors of a commercially printed item, whereby the color tone is controlled.

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