Patent attributes
A printing apparatus comprises an ejection head for selectively ejecting ink droplets of a plurality of sizes to form dots on a printing medium. The printing apparatus is capable of printing a correction pattern on the printing medium, the correction pattern enabling correction of a misalignment between a position at which dots are formed during a forward pass through which the head is moved and a position at which dots are formed during a return pass through which the head is moved, and a spacing in a sub-scanning direction between dots that make up the correction pattern printed by ejecting ink droplets of a certain size from the ejection head is different from a spacing in the sub-scanning direction between dots that make up the correction pattern printed by ejecting ink droplets of a different size from the ejection head.
