A dither matrix selecting device includes a storage unit, a determining unit, and a selecting unit. The storage unit is configured to store a first dither matrix and a second dither matrix different from the first dither matrix. The first dither matrix includes a plurality of sub-matrices. Each sub-matrix of the first dither matrix has a plurality of threshold values such that a single dot grows from a starting pixel as an input value increases. Each sub-matrix has a first region and a second region different from the first region. Each threshold value allocated in the first region is smaller than a prescribed value. An arrangement of each threshold value in the first region is identical for all of the plurality of sub-matrices. The determining unit is configured to determine whether or not toner accommodated in a printing device is a specified toner. The selecting unit is configured to select the first dither matrix when the determining unit determines that the toner is not the specified toner.