Patent ID: 7911650

Claim:
An inkjet printing apparatus configured to perform printing by use of an inkjet head having first ejection-opening arrays each having ejection openings for ejecting first ink arranged in a predetermined direction and second ejection-opening arrays each having ejection openings for ejecting second ink arranged in the predetermined direction, the second ink having a similar color to the first ink and exhibiting a higher gloss level on a printing medium than that exhibited by the first ink on the printing medium, the first ejection-opening arrays being arranged so as to have an overlapping section in a direction crossing the predetermined direction and the second ejection-opening arrays being arranged so as to have an overlapping section in the crossing direction, the inkjet printing apparatus comprising: a determination unit that determines amounts of the first ink and the second ink used to print on a joint section to be printed by the ejection openings included in the overlapping portions, and determines amounts of the first ink and the second ink used to print a non-joint section to be printed by the ejection openings excluded from the overlapping portions, wherein the determination unit determines usage amounts of the first ink and the second ink for the respective joint and non-joint sections such that the amount of the second ink used for expressing a predetermined density is more in a unit area of the joint section than in the unit area of the non-joint section, and the amount of the first ink used for expressing the predetermined density is less in the unit area of the joint section than in the unit area of the non-joint section.