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Printing apparatus and method configured for re-halftone image data

  • US 9,117,163 B2
  • Filed: 03/06/2014
  • Issued: 08/25/2015
  • Est. Priority Date: 03/13/2013
  • Status: Active Grant
First Claim
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1. An image data processing apparatus for processing previously halftoned data that has been halftoned so that a proportion of dot formation corresponding to gradation values of an image reaches a first dot generation rate, as image data representative of the image, the image data processing apparatus comprising:

  • a re-halftone processing unit configured to carry out a re-halftone process by using an error diffusion technique based on first gradation values corresponding to ON-dots in the previously halftoned data; and

    an ON-dot gradation value setting unit configured to set second gradation values corresponding to the ON-dots in the re-halftone process using the error diffusion technique, such that the dot generation rate in the re-halftone process reaches a second dot generation rate different from the first dot generation rate,the first gradation values being determined from a relationship between an original print apparatus for which original dot data is generated and a target print apparatus where printing is to be carried out.

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