Ink jet printer

An ink jet printer, comprising:

• a control unit, which converts externally provided printing data into jetting data associated with a size of dot to be printed;
• a drive signal generator, which generates a drive signal including a plurality of drive pulses;
• a printing head, which includes:
• at least two nozzle rows, each associated with at least one color of ink and including a plurality of nozzles each communicated with a pressure chamber;
• a pressure generating element, which varies pressure inside of the pressure chamber when at least one of the drive pulses is applied;
• a decoder, which decodes the jetting data into pulse select information in accordance with a predetermined conversion relationship;
• and
• a switcher, which selects at least one of the drive pulses to be applied to the pressure generating element in accordance with the pulse select information;
• and
• at least two pattern data, each associated with at least one color of ink different from one another and each defining the conversion relationship.