1. An image processing device comprising: an acquiring unit that acquires invisible image data of an invisible image subject to forming on a recording medium with invisible coloring material and acquires source image data of a source image subject to forming on the recording medium with visible coloring material; and a generating unit that generates corrected-image-data of the source image data corrected according to the absorption wavelength characteristics of the invisible coloring material, such that the color of overlapping regions, where both the invisible image and the source image are superimposed when formed on the recording medium, approximates to the color of regions corresponding to the overlapping regions in the source image.