IMAGE PROCESSING DEVICE, IMAGE PROCESSING METHOD, AND STORAGE MEDIUM

The image processing device of the present invention includes: an image acquiring section (2) acquiring image data; an image data generating section (32) generating attribute data including each attribute value indicative of an attribute to which each of a plurality of pixels constituting an image indicated by the image data acquired by the image acquiring section (2) belongs among predetermined attributes; and image data reducing section (34) reducing the attribute data by converting, to one attribute value, at least two attribute values included in the attribute data generated by the attribute data generating section, according to a priority given to the each attribute value. Therefore, it becomes possible to realize an image processing device that can reduce the attribute data while keeping important information included in the attribute data, and further improve encoding efficiency of the attribute data.