Printing apparatus and printing method

A printing apparatus comprising:

• a printing head including
• a first nozzle row, in which a plurality of nozzles are provided side by side in a nozzle alignment direction, and
• a second nozzle row arranged shifted from the first nozzle row in the nozzle alignment direction and in which a plurality of nozzles are provided side by side in the nozzle alignment direction;
• and
• a control unit configured to control ejection of ink from the plurality of nozzles included in the printing head onto a medium based on print data, wherein
• the control unit is configured to
• assume a virtual nozzle of a boundary portion between the first nozzle row and the second nozzle row, other than ink-ejectable nozzles among the plurality of nozzles of each of the first and second nozzle rows to print an image on the medium, and set an image to be complemented, which is an image of a virtual raster line, as a partial region of the image to be printed on the medium, the virtual raster line corresponding to the virtual nozzle and being a row of pixels side by side in a direction perpendicular to the nozzle alignment direction,
• assign print data for printing the image to be complemented to at least one of a first adjacent nozzle that is a nozzle in the first nozzle row and adjacent to the boundary portion and a second adjacent nozzle that is a nozzle in the second nozzle row and adjacent to the boundary portion, and
• complement the image to be complemented by ink ejection from at least one of the first adjacent nozzle and the second adjacent nozzle based on the print data assigned.