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Method and apparatus for tonal correction in binary printing devices by predistortion of image data utilizing ink reduction processing

  • US 5,625,755 A
  • Filed: 10/11/1994
  • Issued: 04/29/1997
  • Est. Priority Date: 07/01/1994
  • Status: Expired due to Fees
First Claim
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1. A method of printing comprising:

  • a. obtaining a series of pixel data corresponding to a linear segment of source image;

    b. selecting every other one of the pixel data obtained in step a;

    c. filtering the pixel data selected in step b in accordance with a filter function;

    d. processing the pixel data filtered in step c into a halftone pattern which, when printed, exhibits a density pattern lighter than that of the source image in highlight and upper midtone regions and darker than that of the source image in shadow and lower midtone regions; and

    e. printing a series of dots in accordance with the halftone pattern onto a recording medium,wherein the filter function is defined such when the halftone pattern is printed, the printed pattern exhibits a density pattern lighter than that of the source image in highlight and upper midtone regions and darker than that of the source image in shadow and lower midtone regions.

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