Patent ID: 8651634
Filing Date: 2014-02-18
Classification: B41J

Abstract:
1. An image data processing device for processing image data supplied to a liquid ejection device having an inkjet head formed with a plurality of nozzles from which ink droplets are ejectable onto a recording medium, the recording medium having an image formable area defined by a plurality of pixels wherein a predetermined number of pixels is arranged in one-to-one correspondence with the plurality of nozzles, an image being formed on the image formable area of the recording medium while moving at least one of the inkjet head and the recording medium relative to each other, the image data processing device comprising: an image data storing unit that is configured to store image data representing an image density value for each of the plurality of pixels, the image density value being either a first density value that is greater than or equal to a prescribed value or a second density value that is less than the prescribed value; a correction data producing unit that is configured to produce correction data including a plurality of correction density values; and an image density value addition unit that is configured to add the correction density value to the second density value of the corresponding pixel, wherein the correction data producing unit produces a first correction density value and a second correction density value as the correction density value, the first correction density value being added to the second density value by the image density value addition unit, a resultant density value of a first subject pixel being equal to or greater than the first density value, the ink droplet having been unejected from one of the plurality of nozzles corresponding to the first subject pixel for a first predetermined period of time, the second correction density value being added to the second density value by the image density value addition unit, a resultant density value of a second subject pixel being less than the first density value, the ink droplet having been unejected from one of the plurality of nozzles corresponding to the second subject pixel for a period of time shorter than the first predetermined period of time, wherein the ink droplet is ejected on the first subject pixel whereas the ink droplet is unejected on the second subject pixel.