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Generation of halftone overlays for combination with halftoned images

  • US 5,715,382 A
  • Filed: 05/02/1996
  • Issued: 02/03/1998
  • Est. Priority Date: 05/05/1995
  • Status: Expired due to Term
First Claim
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1. A method for rendering a composite image from a background image and an overlay image, wherein:

  • said background image comprises background pixels, each having a background data level;

    said overlay image comprises overlay pixels, each having an overlay data level;

    said composite image comprises composite pixels, each having a composite data level;

    comprising the steps of;

    generating a composite data level for a composite pixel according to;

    a spatially corresponding background data level if a spatially corresponding overlay pixel is not available; and

    a spatially corresponding overlay data level if available;

    rendering said composite image on an output medium as varying optical densities according to said composite data levels.

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