Image forming apparatus and image forming method

An image forming method forming an image on a medium using an image forming apparatus comprising a first nozzle group in which nozzles ejecting ink forming a main image are lined up in a first direction;

• a second nozzle group, in which nozzles ejecting auxiliary ink are lined up in the first direction, lined up with the first nozzle group in a second direction which is perpendicular to the first direction;
• and 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 the image forming method comprising;
• performing repeatedly an ejection operation ejecting ink from the nozzles while relatively moving the nozzle groups and the medium in the second directions and a position changing operation changing the relative position of the medium with respect to the nozzle groups to one side of the first direction, and
• performing a first ejection operation, ejecting ink from the first nozzle group on the region where the main image is formed in the image forming region on the medium, ejecting the auxiliary ink from the second nozzle group on the region where the main image is not formed in the image forming region, and ejecting the auxiliary ink from the third nozzle group over previously deposited ink and auxiliary ink.