INKJET PRINTING APPARATUS

摘要

An inkjet printing apparatus includes: a printing unit including an inkjet head that ejects a red ink and an inkjet head that ejects a black ink having resolution twice that of the above-described inkjet head in a main scanning direction and a sub-scanning direction, respectively, this printing unit performing printing on a sheet by ejecting inks from the inkjet heads while transferring the sheet; and a controller that controls the printing unit. In a pixel at an edge of a line drawing formed by two color inks, the edge being in a landing deviation direction of a dot with the red ink relative to dots with the black ink, the controller increases the number of drops to the dots with black on the side of the landing deviation direction.

主权项

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:
an ejection amount of the first ink to a dot; andan ejection amount of the second ink to a dot located farthest in the landing deviation direction from among a plurality of dots, so as to reduce a color shift at the edge.