Patent ID: 8083337

Claim:
An ink jet printing apparatus in which a printing head that can eject an ink and a processing liquid from a plurality of ejection openings forming an ejection opening array is subjected to a plurality of scannings to a predetermined area on a printing medium to form an image by the ink on the printing medium and to cover the formed image by the processing liquid, said ink jet printing apparatus comprising: a generation unit that generates processing liquid ejection data with regard to the predetermined area for which the formation of the image is completed, the processing liquid ejection data being for ejecting the processing liquid from the printing head in a plurality of scannings of the printing head; a control unit that changes, in accordance with the processing liquid ejection data for a final scanning for ejecting only the processing liquid among the processing liquid ejection data generated by the generation unit, a region per one scanning of the printing head within which the ejection opening array of the printing head is used to form the image and to cover the formed image; and an ejection unit that causes the printing head to eject the processing liquid based on the processing liquid ejection data generated by the generation unit, wherein the generation unit generates different processing liquid ejection data depending on the change by the control unit.