With respect to a configuration for inkjet printing, the disclosure implements a more appropriate configuration in which it is difficult for the quantity of printing to deteriorate. This configuration includes a head unit (12), a main scan driver (14), and a controller (20). When main scan operations are performed, the controller (20) performs control with respect to the same area on the medium (50) such that the head unit (12) ejects ink drops of one selected color onto a plurality of first selection pixels selected on the basis of a first mask data set and a plurality of second selection pixels selected on the basis of a second mask data set that differs from the first mask data set with regard the arrangement of a plurality of pixels to be selected.