Ink jet printing apparatus and ink jet printing method
AssigneeCanon Kabushiki Kaisha
InventorsTakashi Ochiai, Hitoshi Tsuboi, Satoshi Wada
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Abstract
An ink jet printing apparatus and an ink jet printing method can enable high quality printing, without causing uneven thickness in a conveying direction, using a printing head having a plurality of ejection port arrays. To this end, the printing is performed by making distribution ratios of printing in each ejection port array in the printing head different from one another according to gradation.
Claims5
An ink jet printing apparatus for printing an image on a printing medium by ejecting ink from a printing head based on image data, the printing head having a plurality of ejection port arrays each having a plurality of ejection ports which are capable of ejecting the same color ink and are arranged along a first direction, the plurality of ejection port arrays being arranged in a second direction intersecting with the first direction, comprising:
- an acquiring unit that acquires gradation information of the image data;
- and
- a setting unit that sets distribution ratios of the image data with respect to the plurality of ejection port arrays according to the gradation information acquired by said acquiring unit.
An ink jet printing method for printing an image on a printing medium by ejecting ink from a printing head based on image data, the printing head having a plurality of ejection port arrays each having a plurality of ejection ports which are capable of ejecting the same color ink and are arranged along a first direction, the plurality of ejection port arrays being arranged in a second direction intersecting with the first direction, said method comprising the steps of:
- acquiring gradation information of the image data;
- and
- setting, according to the gradation information acquired in said acquiring step, distribution ratios of the image data with respect to the plurality of ejection port arrays.
Dependencies are inferred from the claim text.