Patent ID: 9079420
Filing Date: 2015-07-14
Classification: B41J

Abstract:
1. A printer for printing on a printing medium by moving a printing head, which discharges ink from a nozzle, and the printing medium in a relative manner in a main scanning direction and a sub-scanning direction which intersects the main scanning direction, the printer comprising: a first nozzle group; a second nozzle group which is located at the downstream side of the first nozzle group in the sub-scanning direction; and a control circuit for performing control to cause the ink to be discharged from the first nozzle group and the second nozzle group, the control circuit performing control to cause ink to be discharged from at least one of the first nozzle group and the second nozzle group based on both a portion of first image data which forms a color image layer representing an image and second image data that forms a background image layer, wherein, when ink having the same color is discharged from each of the first nozzle group and the second nozzle group in the same region of the printing medium, the control circuit performs control to cause ink to be discharged from the first nozzle group and the second nozzle group, on the basis of a determined correlation between the amount of ink to be discharged from the first nozzle group and the amount of ink to be discharged from the second nozzle group, and wherein the control circuit performs control, on the basis of the correlation, to reduce the amount of ink discharged from either one of the first nozzle group or the second nozzle group, such that the control circuit eliminates a portion of the first image data corresponding to the ejection of the ink to be ejected over an overlapping area of the background image where ink of a same color of ink is formed.