1. An image processing device, comprising: a separation unit that separates image information including a first image having a plurality of color components and a second image having a specific color component and to be overlaid at least in part on the first image into a specific color component image of the same color component as the specific color component and an image with color components other than the specific color component among the plurality of color components; a color conversion unit that performs color conversion of the image with color components other than the specific color component, separated by the separation unit; and a combination unit that combines the color-converted image with color components other than the specific color component, converted by the color conversion unit, and the specific color component image separated by the separation unit, wherein the combination unit includes a binary image transformation unit that transforms the image combined by the combination unit into a binary image.