Ink-jet printing apparatus capable of increased image uniformity
AssigneeCanon Kabushiki Kaisha
InventorsToshiyuki Yanaka, Toshio Kashino, Yoshie Asakawa
Life of this patent
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Abstract
A high resolution head having smaller ejection amount and a low resolution head having larger ejection amount are employed. With respect to an image to be printed, an image separating portion separates a portion of a field in an image from a portion other than the field. For the field, printing is performed by the low resolution head through process of an image processing portion and a head control portion. As a result of this, for the field in the image, large dot is formed to reduce gap between the dots. Thus, color of the field can be uniform.
Claims57
An ink-jet printing apparatus for performing printing on a printing medium by employing an ink-jet head ejecting an ink, comprising:
- image separating means for discriminating between a predetermined region and a region other than the predetermined region in an image to be printed, and for separating image data corresponding to the predetermined region from image data corresponding to the region other than the predetermined region, the predetermined region and the region other than the predetermined region being different in uniformity of the image;
- and
- control means for driving the ink-jet head on a basis of image data corresponding to respective said regions separated by said image separating means to perform printing, said control means making an ink ejection amount per pixel in said predetermined region greater than that in said region other than said predetermined region.
An ink-jet printing apparatus for performing printing on a printing medium by employing an ink-jet head ejecting an ink, a first ink-jet head and a second ink-jet head having different ink ejection characteristics being employed as the ink-jet head, said apparatus comprising:
- image separating means for discriminating between a region to be printed by using said first ink-jet head and a region to be printed by using said second ink-jet head in an image to be printed, and separating the image data respectively corresponding to respective regions from each other on a basis of a result of discrimination, the separated regions being different in uniformity of the image;
- and
- control means for performing printing using respective said first and said second ink-jet heads on a basis of the image data corresponding to respective regions.
Dependencies are inferred from the claim text.