1. A decorative image data structure stored on a computer-readable recording medium, for representing a decorative image to be added to an input image by means of a image processing apparatus, the decorative image data structure comprising: an element image storage portion for storing color element image data representing a color element image, which is a color image constituting at least a partial area of the decorative image, wherein the color element image data comprises a plurality of image representation components, and the element image storage portion stores a non-rewritable attribute representing whether modification of the image representation components for at least one color element image is permitted for the image processing apparatus.