Patent ID: 9381751
Filing Date: 2016-07-05
CPC Classification: B41J,G06K

Claim Text:
1. An inkjet printing apparatus comprising: a printing unit including a first inkjet head that ejects a first ink, and a second inkjet head that ejects a second ink having a luminance lower than that of the first ink by a predetermined value or more, with a resolution higher than that of the first inkjet head, the printing unit performing printing on a sheet by ejecting the first ink and the second ink from the first inkjet head and the second inkjet head while relatively moving the sheet, the first inkjet head, and the second inkjet head, and a controller that controls the printing unit, wherein in a pixel at an edge of a line drawing including a pixel formed by a dot with the first ink and a plurality of dots with the second ink, the edge being in a landing deviation direction with the first ink relative to dots with the second ink, the controller corrects at least one of the following so as to reduce a color shift at the edge: the first inkjet head has a first series of nozzles arranged in a first direction perpendicular to a sheet feeding direction, the second inkjet head has a second and a third series of nozzles arranged in the first direction, each nozzle of the first series of nozzles is associated with a pair of nozzles of the second and third series of nozzles, each nozzle of the first, second and third series of nozzles has a center, and the center of each nozzle of the first series of nozzles is located between the centers of the associated pair of nozzles of the second and third series of nozzles.