Replacement halftoning
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Abstract
A method and an apparatus to perform replacement halftoning is disclosed. In one embodiment, the method comprises dithering multiple color channels of a pixel of an image to generate a plurality of halftone outputs. Each of the halftones corresponds to a distinct color channel of the pixel. The method further includes creating a virtual color channel from two or more color channels of the plurality of color channels and applying error diffusion to the virtual color channel to generate an error diffusion halftone outputs, and then replacing of the dither output error diffusion halftone outputs.
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Citations
51 Claims
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1-27. -27. (canceled)
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28. A method comprising:
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applying a first halftoning technique to a plurality of color channels associated with a first pixel to generate a first plurality of halftone outputs, each of the plurality of halftone outputs corresponding to a color channel; and
applying a second halftoning technique, different from the first halftoning technique, to a virtual color channel to generate a replacement halftone output, the virtual color channel based on channels of the plurality of color channels.
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29. A method comprising:
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dithering a plurality of color channels associated with a first pixel to generate a plurality of dither halftone outputs, each of the plurality of dither halftone outputs corresponding to a color channel; and
applying error diffusion to the virtual color channel to generate an error diffusion halftone output, the virtual color channel based on channels of the plurality of color channels. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. An article of manufacture having one or more machine-readable media storing instructions which, when executed by a machine, cause the machine to:
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dither a plurality of color channels associated with a first pixel to generate a plurality of dither halftone outputs, each of the plurality of halftone outputs corresponding to a color channel; and
applying error diffusion to the virtual color channel to generate an error diffusion halftone output, the virtual color channel based on channels of the plurality of color channels. - View Dependent Claims (43, 44, 45, 46, 47, 48, 49, 50)
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51. An apparatus comprising:
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a first circuitry to dither a plurality of color channels associated with a first pixel to generate a plurality of dither halftone outputs, each of the plurality of halftone outputs corresponding to a color channel;
a second circuitry to create a virtual color channel from two or more of the plurality of color channels; and
a third circuitry to apply error diffusion to the virtual color channel to generate an error diffusion halftone output.
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Specification