Printing method and apparatus
First Claim
1. A printing method of printing on a printing medium, comprising:
- generating dot data representing a status of dot formation on each of print pixels of a print image to be formed on the printing medium, by performing a halftone process on image data representing an input tone value of each of pixels constituting an original image; and
generating the print image with a print head by mutually combining a plurality of dot groups in a common print area, each of the plurality of dot groups being formed in each scan of the print head in response to the dot data, whereinthe generating dot data comprises setting a condition for the halftone process for reducing contact between dot groups formed consecutively by a plurality of temporally consecutive scan passes within at least part of tone values, whereinthe halftone process condition is set such that a prescribed mixed pattern composed of at least two consecutively formed dot groups has prescribed spatial frequency characteristics.
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Abstract
The invention provides printing method of printing on a printing medium. The method includes: generating dot data representing a status of dot formation on each of print pixels of a print image to be formed on the print medium, by performing a halftone process on image data representing a input tone value of each of pixels constituting an original image; and generating the print image with a print head by mutually combining a plurality dot groups in a common print area, each of the plurality dot groups being formed in each scan of the print head in response to the dot data. The generating dot data comprise setting a condition for the halftone process for reducing contact between dot groups formed consecutively by a plurality of temporally consecutive scan within at least part of tone values.
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Citations
10 Claims
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1. A printing method of printing on a printing medium, comprising:
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generating dot data representing a status of dot formation on each of print pixels of a print image to be formed on the printing medium, by performing a halftone process on image data representing an input tone value of each of pixels constituting an original image; and generating the print image with a print head by mutually combining a plurality of dot groups in a common print area, each of the plurality of dot groups being formed in each scan of the print head in response to the dot data, wherein the generating dot data comprises setting a condition for the halftone process for reducing contact between dot groups formed consecutively by a plurality of temporally consecutive scan passes within at least part of tone values, wherein the halftone process condition is set such that a prescribed mixed pattern composed of at least two consecutively formed dot groups has prescribed spatial frequency characteristics. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A printing method of printing on a printing medium, comprising:
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generating dot data representing a status of dot formation on each of print pixels of a print image to be formed on the printing medium, by performing a halftone process on image data representing an input tone value of each of pixels constituting an original image; and generating the print image with a print head by mutually combining a plurality of dot groups being formed in each scan of the print head in response to the dot data, wherein the generating dot data comprises setting a condition for the halftone process for reducing contact between dot groups formed consecutively by a plurality of temporally consecutive scan passes within at least part of tone values, wherein the generating dot data comprises determining a state of dot formation by diffusing error into neighboring pixels, the neighboring pixels being print pixels neighboring a targeted pixel targeted for decision of the state of dot formation and for which the state of dot formation is undecided; and
whereinthe diffusing error includes increasing the diffusing error into pixels belonging to a specific pixel group among the neighboring pixels, the specific pixel group being for which the at least two consecutively formed dot groups are formed. - View Dependent Claims (9)
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10. A printing apparatus for printing on a printing medium, comprising:
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a dot data generator that generates dot data representing a status of dot formation on each of print pixels of a print image to be formed on the print medium, by performing a halftone process on image data representing an input tone value of each of pixels constituting an original image; and a print image generator having a print head and generating the print image with a print head by mutually combining a plurality of dot groups in a common print area, each of the plurality of dot groups being formed in each scan of the print head in response to the dot data, wherein the dot data generator is configured such that a condition for the halftone process is set for reducing contact between dot groups formed consecutively by a plurality of temporally consecutive scan passes within at least part of tone values, wherein the halftone process condition is set such that a prescribed mixed pattern composed of at least two consecutively formed dot groups has prescribed spatial frequency characteristics.
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Specification