Abstract: An image forming apparatus includes: a classification unit configured to classify ink colors to be superimposedly ejected in a region with a color tone change within a color image formed on a print sheet into a reference color exempted from an ejection timing correction and a correction color subjected to the ejection timing correction, for each line, based on information on comparison between minimum drop numbers acquired by a drop number acquisition unit and information on comparison between drop number distributions acquired by a distribution acquisition unit; a correction scheme acquisition unit configured to acquire a correction scheme of the ink ejection timing of the correction color in the region, for each line; and a correction unit configured to correct the ink ejection timing of the correction color in the region with the correction scheme acquired by the correction scheme acquisition unit, for each line.

Abstract: 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.

Abstract: 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.

Abstract: An image forming apparatus includes: a classification unit configured to classify ink colors to be superimposedly ejected in a region with a color tone change within a color image formed on a print sheet into a reference color exempted from an ejection timing correction and a correction color subjected to the ejection timing correction, for each line, based on information on comparison between minimum drop numbers acquired by a drop number acquisition unit and information on comparison between drop number distributions acquired by a distribution acquisition unit; a correction scheme acquisition unit configured to acquire a correction scheme of the ink ejection timing of the correction color in the region, for each line; and a correction unit configured to correct the ink ejection timing of the correction color in the region with the correction scheme acquired by the correction scheme acquisition unit, for each line.

Abstract: An image forming device and an image forming method capable of suppressing a deviation of ink landing position generated by transfer unevenness of a transfer belt and also suppressing a deviation of ink landing position at a fine level generated by the different causes by generating correction profile data specifying a correction value of ink ejection timing from contents of the deviation of landing position of each pixel calculated by reading a test pattern image printed by an inkjet printer by a scanner unit and by performing ink ejection timing correction using the correction profile data.

Abstract: An image forming device and an image forming method capable of suppressing a deviation of ink landing position generated by transfer unevenness of a transfer belt and also suppressing a deviation of ink landing position at a fine level generated by the different causes by generating correction profile data specifying a correction value of ink ejection timing from contents of the deviation of landing position of each pixel calculated by reading a test pattern image printed by an inkjet printer by a scanner unit and by performing ink ejection timing correction using the correction profile data.