Print processing for performing sub-scanning combining a plurality of feed amounts

Abstract

Printing is carried out on a printing medium during main scanning using a printing device which comprises a print head having one or more nozzle arrays each including a plurality of nozzles for forming dots of same color. The plurality of nozzles for forming dots of the same color have a constant nozzle pitch k×D in the sub-scan direction, where k is an integer of 2 or greater and D is a dot pitch that corresponds to a printing resolution in the sub-scan direction. Each main scan line is scanned S times, where S is an integer of 2 or greater, using different nozzles. A combination of different values is used as feed amounts for S×k sub-scans. When the feed amounts for the S×k sub-scans are divided into S groups each containing k feed amounts for consecutive k sub-scans, a sequence of sub-scan feed amounts in at least one of the S groups of sub-scans is different from sequences in the other groups.