Patent ID: 7128383

Claim:
A liquid ejection apparatus, comprising: a head member, provided with nozzles including a plurality of nozzle groups each associated with one of a plurality of colors of liquid; a plurality of pressure fluctuation generators, each of which is operable to generate pressure fluctuation in liquid in each of the nozzles to eject a liquid droplet therefrom; a carriage, operable to carry the head member so as to reciprocately transverse a first region in which a medium, on which the liquid droplet is landed, is placed; a signal generator, operable to generate a first signal and a second signal; a controller, operable to drive the pressure fluctuation generator according to the first signal and ejection pattern data in a case where the head member transverse the first region in a first direction, and to drive the pressure fluctuation generator according to the second signal and the ejection pattern data in a case where the head member transverse the first region in a second direction opposite to the first direction; and a pattern data adjuster, operable to adjust ejection pattern data so as to vary an ejected number of the liquid droplets per unit area, for each of the nozzle groups wherein the pattern data adjuster adjusts the ejection pattern data so as to vary relative percentages among liquid droplets of the respective colors in all liquid droplets ejected in the unit area.