An original reading unit that inputs image data; an image generation unit that generates an image based on the image data; an image output unit that outputs, as a preview image, the image generated based on the image data; a touch panel display that displays the preview image; a color change region specifying unit that specifies, in the preview image, a region, a color of which is changed; and a control unit that performs control so that color change of the region specified by the color change region specifying unit is performed are included.