Image forming device which can form an image by printing a plurality of pixel unit areas which are composed of multiple sub pixels

摘要: An image forming device which can form an by printing a plurality of dots based on information that contains density data corresponding to pixels defined the fractionalization original image, and express controlling number be printed within predetermined tone unit area. The includes threshold pattern generator for generating is repetition basic including "L" thresholds, comparator comparing respective with "M" thresholds selected from all in not integer multiple "M", producing print data; printer sheet line along main scanning direction.