1. An image processing apparatus comprising: a blank-area identifying unit that identifies a blank area having a size exceeding a predetermined size, from a non-specifying-mark image portion of a recording area image of a recording area that includes individual images and a specifying mark specifying an area containing images among the individual images, the non-specifying-mark image portion being an image portion of the recording area image other than a specifying-mark image that represents the specifying mark, the recording area image being represented by image information; and a concealing unit that conceals a divided area specified by the specifying-mark image, among divided areas obtained by dividing a non-blank area by a gap having a width equal to or larger than a threshold in a specific direction, among gaps between the individual images arranged in the specific direction in the non-blank area, the non-blank area being an area of the non-specifying-mark image portion of the recording area image other than the blank area identified by the blank-area identifying unit.