1. An image formation apparatus comprising: a data generation unit configured to generate image data based on image formation data giving an instruction to print an image including image regions, the image data indicating a corresponding image region pixel value associated with the pixels of each of the image regions; and an image formation unit configured to form the image on a recording medium based on the image data generated by the data generation unit, wherein the data generation unit generates the image data such that a boundary between one of the image regions and an image region adjacent to the one image region is highlighted, if the corresponding image region pixel value of the one image region and the corresponding image region pixel value of the adjacent image region are approximately equal to each other.