Patent ID: 7284814

Claim:
An ink jet printing apparatus comprising print medium conveying means for conveying a print medium, scanning means for moving a print head, which ejects ink droplets, along a main scanning direction crossing a direction in which the print medium is conveyed, and printing control means for controlling an operation performed by the print head to eject droplets, wherein said print medium conveying means comprises at least a pair of rollers located upstream of an area printed by said print head, wherein said printing control means comprises: first printing control means for allowing formation of test patterns used to adjust landing positions of ink droplets in the main scanning direction, the ink droplets ejected by the print head onto the print medium; and second printing control means for controlling the operation performed by said print head to eject ink droplets in the main scanning direction on the basis of landing position adjustment values for the ink droplets determined on the basis of said test patterns, and wherein before a trailing edge of the print medium passes through said conveying means, said second printing control means performs an ink ejecting operation on the basis of a first landing position adjustment value, and after a trailing edge of the print medium passes through said conveying means, on the basis of a second landing position adjustment value determined on the basis of the first landing position adjustment value and a correction value, the second landing position adjustment value being different from the first landing position adjustment value.