An image processing device converts input image data to converted image data and produces scaled image data based on the converted image data. Each set of converted pixel data in the converted image data includes an achromatic color value and a plurality of chromatic color values. The achromatic color value indicates an amount of an achromatic color material. Each of the plurality of chromatic color values indicates an amount of one of a plurality of chromatic color materials. An achromatic color is produced by mixing at least one of the achromatic color material and the plurality of chromatic color materials. Each set of scaled pixel data in the scaled image data corresponds to at least one set of converted pixel data. The image processing device produces each set of scaled pixel data based on the corresponding at least one set of converted pixel data.