The image processor performs aberration correction processing for correcting aberration due to a photographic lens on input image data obtained from an image optically photographed through the photographic lens of a camera and predetermined image processing on the input image data so as to obtain output image data. The predetermined image processing is performed after the aberration correction processing. Alternatively, The predetermined image processing is performed prior to the aberration correction processing. As a result, the image processor is capable of correcting the aberration due to the lens which degrades the quality of a print without causing any inconvenience, thereby obtaining a high-quality image.