Patent ID: 8220893

Claim:
An image forming apparatus comprising: a conveyance mechanism which conveys a recording medium; a liquid ejection head which has a plurality of ejection openings positioned at predetermined intervals in a perpendicular direction perpendicular to a conveyance direction in which a recording medium is conveyed by the conveyance mechanism, each of the intervals corresponding to a print resolution in the perpendicular direction; a driving data storage which stores therein driving data of the liquid ejection head, the driving data indicating a volume of liquid to be ejected through each of the ejection openings in each print cycle in printing onto one recording medium, the volume of liquid selected from a plurality of different predetermined volumes of ink including “zero,” and the print cycle corresponding to a period required for the conveyance mechanism to convey a recording medium for a unit distance corresponding to a print resolution in the conveyance direction; a converter which converts the driving data stored in the driving data storage so that, in each of the ejection openings, when a volume of liquid to be ejected in an (m+1)-th print cycle following an m-th print cycle in which no liquid is to be ejected is a maximum volume of ink among the predetermined volumes, the volume of liquid to be ejected in the m-th print cycle being one of the predetermined volumes other than “zero” and the maximum volume, “m” being an integer number no less than “0”; a convert instructor which instructs the converter, in a switchable manner, whether to convert the driving data; and a head controller which controls the liquid ejection head so that each volume of liquid is ejected through each of the ejection openings, based on the driving data stored in the driving data storage including the driving data converted by the converter.