Patent ID: 8599430

Claim:
An image processing device comprising: an original image data acquiring unit that is configured to acquire original image data indicative of an original image, the original image extending in a first direction and a second direction orthogonal to the first direction, the original image data including a plurality of sets of original pixel data, the original image having a first resolution, the original image having a first size, the original image being divided into a plurality of original grids, each original grid corresponding to a set of original pixel data; a reducing unit that is configured to create reduced image data by performing a reduction process on the original image data, the reduced image data including a plurality of sets of reduced pixel data, the reduced image data being indicative of a reduced image, the reduced image extending in the first direction and the second direction, the reduced image having a second resolution lower than the first resolution, the reduced image having a second size same as the first size, the reduced image being divided into a plurality of reduced grids, each reduced grid corresponding to a set of reduced pixel data, the reducing unit including: an acquiring unit that is configured to acquire, for each set of reduced pixel data, at least one set of original pixel data satisfying a following condition that the at least one set of original pixel data corresponds to the original grid whose part is superposed on the reduced grid corresponding to the each set of reduced pixel data when the reduced image is partially superposed on the original image such that the reduced image is shifted, from an original position at which the reduced image is entirely superposed on the original image, in the second direction by a prescribed length shorter than a length of one original grid; a reduced pixel data producing unit that is configured to produce the reduced pixel data by calculating a weighted average of the at least one set of original pixel data acquired by the acquiring unit based on size ratio, each size ratio being defined as a ratio of a size of the part of original grid that is superposed on the reduced grid corresponding to the reduced pixel data to a size of the reduced grid; and a transmitting unit that is configured to transmit the reduced image data to an image forming unit, the image forming unit configured to form the reduced image on a recording medium based on the reduced image data by ejecting ink droplets while reciprocating a recording head in a main scanning direction, the recording head moving relative to the recording medium in a sub-scanning direction orthogonal to the main scanning direction, the main scanning direction corresponding to the first direction, the sub-scanning direction corresponding to the second direction.