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Raster image processor with printhead profile compensation for a multi level digital printing machine

  • US 9,734,440 B2
  • Filed: 04/30/2015
  • Issued: 08/15/2017
  • Est. Priority Date: 01/29/2014
  • Status: Active Grant
First Claim
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1. A method of generating a screened multi-bit data output file for a digital printing machine having first and second nozzles that each can print on a page a first printable tone level, a second printable tone level, and a third printable tone level, from an unscreened raster data file specifying a continuous tone value for a first colorant for each printable position of the page, the method comprising the steps of:

  • (a) creating a first printer profile comprising density measurements for the first colorant from the first nozzle;

    (b) creating a first set of tonal sub-ranges based upon said first printer profile of the first nozzle;

    said first set of tonal sub-ranges comprising first and second tonal sub-ranges corresponding to the first and second printable tone levels, respectively, for the first colorant;

    (c) creating a second printer profile comprising density measurements for the first colorant from the second nozzle that are different that the density measurements of the first printer profile; and

    (d) creating a second set of tonal sub-ranges based upon said second printer profile of the second nozzle;

    said second set of tonal sub-ranges comprising first and second tonal sub-ranges corresponding to the first and second printable tone levels, respectively, for the first colorant.

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