IMAGE PROCESSOR, MEDIUM AND IMAGE PROCESSING PROGRAM

PROBLEM TO BE SOLVED: To provide an image processor which suppresses a difference due to displacement between displacement and distortion, which occur by image reading means, and outputs an image in which occurrence of the distortion can be found.SOLUTION: Image reading means of an image processor reads a first image which is an image of a first medium in which a plurality of reference graphics are drawn and a graphic for alignment with a second image is drawn and the second image which is an image of a second medium in which a plurality of graphics whose center coordinate is matched with that of the reference graphic are drawn and a graphic for alignment with the image of the first medium is drawn. Alignment means aligns the first image and the second image on the basis of the graphics for alignment in the first image and the second image. Differential processing means performs processing for generating a differential image between the first image and the second image, which are aligned, and output means outputs the differential image.