Patent ID: 7275801

Claim:
An image forming apparatus, comprising: a conveyance device which performs relative movement of an ejection head and a recording medium by conveying at least one of the ejection head and the recording medium in a uniform relative movement direction; the ejection head which includes ink ejection ports two-dimensionally arranged, the ejection head performing an ink ejection operation of ejecting ink droplets through the ink ejection ports toward the recording medium in conjunction with the relative movement performed by the conveyance device so as to compose a line-shaped dot row in a main scanning direction substantially perpendicular to the relative movement direction from dots formed by the ink droplets deposited on the recording medium, adjacent two of the dots being arranged to overlap at least partially with each other, one of pairs of adjacent two of the ink ejection ports being a maximum-landing-time-difference pair where a landing time difference between the adjacent two of the dots arranged in the line-shaped dot row is maximum, a pitch in the main scanning direction between the maximum-landing-time-difference pair being smaller than pitches in the main scanning direction of others of the pairs of adjacent two of the ink ejection ports; an ink quantity data generation device which generates ink quantity data on pixels from image data on print object; an ink quantity data correction device which corrects the ink quantity data on at least one of the pixels to be formed by the ink droplets ejected from at least one of the ink ejection ports of the maximum-landing-time-difference pair, in accordance with the ink quantity data generated by the ink quantity data generation device; and an ejection control device which controls the ink ejection operation of the ejection head in accordance with the ink quantity data on the pixels including the ink quantity data having been corrected by the ink quantity data correction device.