Patent ID: 8622502

Claim:
An ink jet printing apparatus that prints an image on a print medium, comprising: a print head that includes first nozzles, second nozzles, third nozzles, and fourth nozzles, wherein (a) the first nozzles form a first nozzle array and are arrayed in a predetermined direction for ejecting a first ink, (b) the second nozzles form a second nozzle array and are arrayed in the predetermined direction for ejecting the first ink, (c) the third nozzles form a third nozzle array, which is disposed between the first nozzle array and the second nozzle array, and the third nozzles are arrayed in the predetermined direction for ejecting a second ink, which is different from the first ink in color, and (d) the fourth nozzles form a fourth nozzle array, which is disposed between the first nozzle array and the third nozzle array, and the fourth nozzles are arrayed in the predetermined direction for ejecting the second ink; a scanning unit that executes a relative scan of the print head and the print medium in a first direction crossing the predetermined direction; a setting unit that sets allocation ratios of an ejection of ink for each nozzle array, such that (a) an allocation ratio for the first nozzle array is higher than an allocation ratio for the second nozzle array, and an allocation ratio for the third nozzle array is higher than an allocation ratio for the fourth nozzle array, for a same scan by the scanning unit, or (b) the allocation ratio for the second nozzle array is higher than the allocation ratio for the first nozzle array, and the allocation ratio for the fourth nozzle array is higher than the allocation ratio for the third nozzle array, for the same scan by the scanning unit; and a control unit that controls ink ejection from the print head in accordance with the allocation ratios set by the setting unit.