1. An image formation apparatus for forming a three dimensional print image on a recording medium by an image of three dimensional printing material and an image of color material in accordance with image data, comprising: designation means for designating a three dimensional print region using three dimensional printing material and a non-three dimensional print region, with regard to the image data; and image processing means for performing different color conversions on the image data depending on the three dimensional print region and the non-three dimensional print region designated by the designation means.