Patent ID: 8353569

Claim:
An inkjet printing apparatus which performs printing on a printing medium by ejecting ink from a printing unit configured to eject a plurality of chromatic inks and a plurality of achromatic inks while moving the printing unit relative to the printing medium, comprising: an acquiring unit configured to acquire, for each unit region obtained by dividing a region including a vicinity of a boundary between bands to be printed by movements of the printing unit, information on amounts of inks to be applied to the unit region with respect to each ink color; and a reduction processing unit configured to perform a first reduction processing which determines a hue of the unit region based on the information on the amounts of the chromatic inks to be applied to the unit region acquired by the acquiring unit and reduces each of the amounts of the chromatic inks to be applied to the unit region according to the determined hue and a second reduction processing which reduces each of the amounts of the achromatic inks to be applied to the unit region based on the information on the amounts of the achromatic inks to be applied to the unit region acquired by the acquiring unit.