A printing apparatus including a head unit 12, a main scan driver 14, and a controller 20 is provided. The head unit 12 includes a first-color nozzle and a second-color nozzle, and performs main scan operations in an outward direction and main scan operations in a homeward direction. During each main scan operation, the controller 20 selects some pixels, as first-color ejection object pixels for which ink drops of a first color should be ejected, from pixels included in an area of a medium 50 which is an object of the corresponding main scan operation, and selects at least some pixels other than the first-color ejection object pixels, as second-color ejection object pixels for which ink drops of a second color should be ejected, from the pixels included in the area of the medium which is the object of the corresponding main scan operation.