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Pagewidth inkjet printer having composite image printing control

  • US 7,173,739 B2
  • Filed: 05/06/2005
  • Issued: 02/06/2007
  • Est. Priority Date: 05/23/2000
  • Status: Expired due to Fees
First Claim
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1. A printer comprising:

  • a pagewidth inkjet printhead for printing bi-level dots of ink onto print media at a resolution of 800 to 1600 dpi; and

    at least one controller for controlling the pagewidth inkjet printhead, the, or each, controller comprising;

    a receiver for receiving compressed page data to be printed by the printhead;

    a first decoder configured to decode any compressed continuous tone image planes in the received compressed page data at a resolution of up to 320 ppi in each plane;

    a second decoder configured to decode any compressed bi-level image planes in the received compressed page data at a resolution of 320 to 1600 dpi in each plane;

    a half-toner/compositor for creating a composite image by halftoning the continuous tone image planes decoded by the first decoder and compositing the bi-level image planes decoded by the second decoder over the halftoned continuous tone image planes; and

    a printhead driver arranged to output the composite image to the printhead.

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