Patent ID: 8625163

Claim:
A dither matrix selecting device comprising: a storage unit that stores a first dither matrix and a second dither matrix different from the first dither matrix therein, the first dither matrix including a plurality of sub-matrices, each sub-matrix of the first dither matrix having a plurality of threshold values such that a single dot grows from a starting pixel as an input value increases, each sub-matrix having a first region and a second region different from the first region, each threshold value that is allocated in the first region being smaller than a prescribed value, an arrangement of each threshold value in the first region being identical for all of the plurality of sub-matrices; a processor; and a memory storing instructions that, when executed by the processor, cause the dither matrix selecting device to: determine whether toner accommodated in a printing device is (a) a specified toner or (b) toner other than the specified toner; and select the first dither matrix when the toner is determined to be (b) the toner other than the specified toner.