Patent ID: 7306310

Claim:
A computer readable medium having instructions stored thereon, the instructions for creating print data utilized by an ink jet printer to print ink on a print medium, the ink jet printer comprising an ink jet head moving along a predetermined direction with respect to said print medium, the ink jet head comprising a plurality of nozzle units, each nozzle unit comprising at least two nozzles aligned along the predetermined direction, the nozzles being capable of discharging ink of the same color, and each nozzle unit being capable of forming one dot on the print medium by discharging the ink from one nozzle selected from the nozzles of the nozzle unit, the instructions ordering a computer to perform: a reading step of reading image data including a plurality of first combinations, each first combination comprising a position and information concerning whether the dot is to be formed at the position; and a print data creating step of creating the print data by creating a second combination for each position at which the dot is to be formed, each second combination comprising the position at which the dot is to be formed and one nozzle randomly selected from the nozzles of the nozzle unit which corresponds to the position, wherein in the print data creating step, it is prohibited to select the same nozzle for more than a predetermined number of positions continuously aligned along the predetermined direction.