Abstract: Provided is a program that is executed by an image processing apparatus including a memory and a processor, and which generates two-dimensional image data obtained by performing perspective projection to a virtual three-dimensional space on a prescribed perspective projection plane. The program causes the processor to perform processes of (a) arranging a viewpoint in the virtual three-dimensional space, generating basic image data by performing perspective projection on the perspective projection plane set in correspondence to the viewpoint, and storing the basic image data in the memory; (b) setting a concentration map showing a concentration value associated with a partial region of the basic image data, and storing the concentration map in the memory; (c) reading texture data from the memory; and (d) generating the two-dimensional image data by synthesizing the texture data with the basic image data at a ratio according to the concentration value set with the concentration map.