| 摘要 |
<p>An image forming apparatus (1) includes print heads (11, 12, 13, 14); a first color-conversion processing unit (1015); a second color-conversion processing unit (1025); and an on/off switching unit (1026). The print heads (11, 12, 13, 14) eject ink droplets of a plurality of coloring materials from nozzles thereof onto a recording sheet (15) conveyed by a conveying unit (101). The print head (14) for a first coloring material among the plurality of coloring materials is arranged such that the first coloring material is to be ejected later than other coloring materials on each of a forward stroke and a backward stroke in bi-directional printing, and the print heads (11, 12, 13) for the other coloring materials are arranged in tandem in a main-scanning direction. The first color-conversion processing unit (1015) converts input image data into first image data for the plurality of coloring materials for use by the print heads (11, 12, 13, 14) in printing in any one direction of the forward stroke and the backward stroke. The second color-conversion processing unit (1025) converts a part of the first image data into second image data for the other coloring materials for use in printing in a direction opposite from the one direction. The part of the first image data is obtained by excluding image data for the first coloring material from the first color image data. The an on/off switching unit (1026) switches between causing and not causing the second color-conversion processing unit (1025) to covert the part of the first image data depending on which one of printing in the forward stroke and printing in the backward stroke is to be performer the print heads (11, 12, 13, 14).</p> |
