1. An image processing device comprising: an input unit which inputs image data that is generated by an imaging element including specific pixels having color filters different from color filters of image generation pixels for generating an image or a configuration different from that of the image generation pixels, first image generation pixels that are the image generation pixels adjacent to the specific pixels, and second image generation pixels that are the image generation pixels not adjacent to the specific pixels, and includes a luminance value generated by each of the pixels; and a color mixture correction unit which corrects color mixture based on the input image data such that a change value of luminance caused by light leaked from the specific pixels to the first image generation pixels is calculated based on luminance values of each of specific pixels adjacent to the first image generation pixels and correction of color mixture to the first image generation pixels caused by the leaked light based on the calculated change value is performed.