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 having absorption wavelength characteristics wherein light within visible wavelengths is at least partially absorbed, wherein the acquiring unit acquires source image data of a source image subject to forming on the recording medium with visible coloring material; an overlapping region calculating unit that calculates an overlapping region of an image of the invisible data and an image of the source image data; and a generating unit that generates corrected-image-data of a pixel within the overlapping region of the source image data corrected according to the absorption wavelength characteristics, such that a color of the pixel within the overlapping region, where both a pixel of the invisible image and a pixel of the source image are superimposed when formed on the recording medium, is at least nearly an identical color to a color of the pixel of the source image within a region corresponding to the overlapping region.