IMAGE PROCESSOR AND IMAGE PROCESSING METHOD AND STORAGE MEDIUM

PROBLEM TO BE SOLVED: To provide an image processing technique for operating a superimposing processing with high processing efficiency by reducing a data capacity necessary for the processing. SOLUTION: A control part 55 of an image processor sets color data in the image data of a superimposed area and a base area included in an original image, and a flag setting part 56 applies an identifier for indicating whether or not those areas are 'superimposed areas'. At the time of preparation processing, an image dividing part 57 divides the original image into the superimposed area image including only the superimposed area and the base area image including only the base area by referring to the identifier. Then, at the time of processing a loose area obtained at the time when the superimposed area is present in the base area image, an interpolating part 58 successively copies the color data of the surrounding area of the loose area as the color data for interpolating the base area image. Afterwards, an overlapping part 59 overlaps the superimposed area image on the base area image after interpolation, and outputs an edition.