Ink jet printing apparatus and ink jet printing method
AssigneeCanon Kabushiki Kaisha
InventorsDaigoro Kanematsu, Rie Takekoshi, Mitsutoshi Nagamura
Life of this patent
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Abstract
Disclosed is an ink jet printing apparatus and an ink jet printing method whereby the occurrence of smearing and boundary bleeding can be prevented, and high quality images, such as black characters, can be printed. According to the present invention, in high black duty matrix detection processing, a printing area wherein black dots are to be formed at a comparatively high duty is detected, and in adjacent color matrix detection processing, a printing area wherein color dot is to be formed and an adjacent printing area adjacent to the printing area are detected. Based on the detection information, data for providing color dot is generated.
Claims19
An ink jet printing apparatus using a printing head capable of ejecting black ink and at least one color ink for printing an image on a printing medium by forming black dots of the black ink and color dots of the color ink based on black data for ejecting the black ink and color data for ejecting the color ink, comprising:
- first detecting means for detecting a first printing area in which the number of the black dots to be formed is a predetermined value or greater, based on the black data;
- second detecting means for detecting, as a second printing area, a printing area in which the color dots are to be formed and an adjacent printing area adjacent to the printing area, based on the color data;
- first providing data generating means for generating first providing data for providing the color dots in the first printing area, based on the black data corresponding to the first printing area;
- second providing data generating means for generating second providing data for providing the color dots in the second printing area, based on the black data corresponding to the second printing area;
- printing color data generating means for generating printing color data based on the first providing data, the second providing data and the color data;
- and
- control means for controlling the printing head based on the black data and the printing color data for printing the image.
An ink jet printing method using a printing head capable of ejecting black ink and at least one color ink for printing an image on a printing medium by forming black dots of the black ink and color dots of the color ink based on black data for ejecting the black ink and color data for ejecting the color ink, comprising the steps of:
- detecting a first printing area in which the number of the black dots to be formed is a predetermined value or greater, based on the black data;
- detecting, as a second printing area, a printing area in which the color dots are to be formed and an adjacent printing area adjacent to the printing area, based on the color data;
- generating first providing data for providing the color dots in the first printing area, based on the black data corresponding to the first printing area;
- generating second providing data for providing the color dots in the second printing area, based on the black data corresponding to the second printing area;
- generating printing color data based on the first providing data, the second providing data and the color data;
- and
- controlling the printing head based on the black data and the printing color data for printing the image.
Dependencies are inferred from the claim text.