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Creating composite page images from compressed data

  • US 6,982,799 B2
  • Filed: 04/24/2003
  • Issued: 01/03/2006
  • Est. Priority Date: 04/23/1999
  • Status: Expired due to Fees
First Claim
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1. A printer for printing of a page, the printer includingat least one inkjet printhead,a printhead controller;

  • an interface for receiving data relating to the page to be printed, the data including a page description comprising a bi-level black layer and a contone color layer;

    at least one raster image processor adapted to raster the received data and compress the rastered data;

    the printhead controller including;

    a decoding unit that extracts from the compressed rastered data first data relating to the bi-level black layer and second data relating to the contone color layer;

    memory that temporarily stores the first and second data;

    a ditherer/compositor unit operable to;

    produce a dithered bi-level color layer based on the second data,produce a bi-level black layer based on the first data andcomposite the bi-level black layer on the color layer after dithering thereof to produce a page image;

    wherein the printhead controller controls the printhead to print the dithered/composited page image.

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