An image processing apparatus which sends attribute information to an output correction unit configured to determine based on the attribute information whether to print with only a black coloring material (K) or to print with a plurality of coloring materials (CMYK), includes an attribute change unit configured to make a determination to perform processing for changing the attribute information of compressed data, whose rendering color is monochrome and which is compressed by a compression format (MMR) for compressing a monochromatic image, from an attribute which is printed with a plurality of coloring materials to an attribute which is printed with only a black coloring material, and to perform the processing for changing the attribute information based on the determination.