Patent ID: 8441689

Claim:
An image data creation device that creates image data used in an ink-jet device capable of landing ink with a multi-pass method, the image data creation device comprising: an image data creation unit that creates the image data so that the ink-jet device forms an image with halftone dots which are configured so that a relationship between a pass number and a dot pitch in a vertical scanning direction of a head of the ink-jet device does not become an integral multiple relationship when the pass number is an odd number, and so that the dot pitch does not become an even number when the pass number is even number, wherein the pass number is a number that represents a number of times that the head of the ink-jet device moves in a scanning direction to complete a single image region, the dot pitch represents a number of cells in the vertical scanning direction that constitutes one of the halftone dots in a printed image, and the single image region is completed by dividing nozzles, which are provided to the head of the ink-jet device successively in the vertical scanning direction, into multiple notional blocks, and filling up gaps between landed inks with ink discharged from each block by scanning a number of times equal to the pass number that is equal to a number of the multiple notional blocks.