1. An image processing device including at least one processor detecting a color drift of an input image, comprising: a saturation reducing section reducing a saturation of the input image to suppress false color structures generated as a result of saturation emphasis in an electronic camera and generating via the at least one processor a saturation reduction image in which structural drifts of color components are removed by color drift correction; and a color position drift detecting section detecting a color position drift between color edges of the saturation reduction image.