Patent ID: 8783807

Claim:
An image forming apparatus comprising: (A) a first nozzle group in which nozzles ejecting ink forming a main image are lined up in a first direction; (B) a second nozzle group, in which nozzles ejecting auxiliary ink are lined up in the first direction, and lined up with the first nozzle group in a second direction which is perpendicular to the first direction; (C) a third nozzle group, in which nozzles ejecting the auxiliary ink are lined up in the first direction, positioned on one side of the first direction relative to the first nozzle group and the second nozzle group and downstream of the first nozzle group and the second nozzle group; and (D) a control unit that repeatedly performs an ejection operation ejecting ink from the nozzles while relatively moving the nozzle groups and a medium in the second direction and a position changing operation changing a relative position of the medium with respect to the nozzle groups to one side of the first direction, in which, in a first ejection operation, ink is ejected from the first nozzle group on a region where the main image is formed in the image forming region on the medium, the auxiliary ink is ejected from the second nozzle group on a region where the main image is not formed in the image forming region, and, the auxiliary ink is ejected from the third nozzle group previously deposited ink and auxiliary ink.