Patent ID: 8439464

Claim:
An inkjet printing apparatus for performing printing on a printing medium by using a printing head including a first nozzle array formed by arranging nozzles, for ejecting ink of a first color, in a predetermined direction and a second nozzle array formed by arranging nozzles, for ejecting ink of a second color different from the first color, in the predetermined direction, the apparatus comprising: a scanning unit that performs scans of the printing head with respect to the printing medium in a scan direction crossing the predetermined direction; a conveying unit that conveys the printing medium in a convey direction crossing the scan direction; and a print controller constructed to selectively execute, depending on a conveying position of the printing medium, a scan for performing a printing in a first printing control process, a scan for performing a printing in a second printing control process, and a scan for performing a printing in a third printing control process, wherein in the first printing control process, nozzles to be used are provided in a predetermined range of the first nozzle array and in a predetermined range of the second nozzle array, wherein in the second printing control process, nozzles to be used are provided in a first range of the first nozzle array and in a second range of the second nozzle array, a position of the first range in the first nozzle array and a position of the second range in the second nozzle array being substantially equal in the convey direction, the first range being smaller than the predetermined range of the first nozzle array, the second range being smaller than the predetermined range of the second nozzle array, and wherein in the third printing control process, nozzles to be used are provided in a third range of the first nozzle array and in a fourth range of the second nozzle array, a position of the third range of the first nozzle array and a position of the fourth range of the second nozzle array being shifted from each other in the convey direction, the third range being smaller than the predetermined range of the first nozzle array, the fourth range being smaller than the predetermined range of the second nozzle array.