1. An image processing device for a deformed object obtained by deformation of a medium after an image is formed on the medium, the image processing device comprising: a storage part configured to store a correlation between a pre-deformation color and a post-deformation color that reflects a color variation accompanying a deformation, with respect to a degree of deformation of the medium; an acquisition part configured to acquire degree-of-deformation information and color information for each region of the deformed object; and a determination part configured to determine a color of the image based on the degree-of-deformation information, the color information, and the correlation, so that the post-deformation color of each region of the deformed object approximates the color information.