Patent ID: 8651614

Claim:
An inkjet printing apparatus for performing printing based on image data by scanning a printing head in a direction that intersects a conveying direction of a printing medium, and discharging ink from the printing head onto the printing medium, comprising: a conveying unit that has a roller that drives an endless belt and a static charge unit that charges the belt, configured to convey the printing medium in the conveying direction by causing the printing medium to adsorb to a surface of the belt by electrostatic force, and causing the belt to be driven by the roller; an acquisition unit configured to acquire a surface potential of the printing medium that has been conveyed to a position directly below the printing head by the conveying unit when printing is performed based on test data by discharging ink from the printing head onto the printing medium; a determination unit configured to obtain a discharge speed of the ink that has been associated in advance with the surface potential acquired by the acquisition unit, and configured to determine an amount of variation in a landing position of the ink on the printing medium based on a scanning speed of the printing head, a distance from the printing head to the printing medium, and the discharge speed of the ink; a correction unit configured to correct a timing according to which the ink is discharged from the printing head so as to cancel out the amount of variation in the landing position determined by the determination unit; and a printing unit configured to perform printing based on the image data by discharging ink from the printing head onto the printing medium in accordance with the timing corrected by the correction unit.