1. An image processing method, comprising: receiving a plurality of images as inputs, and estimating a designation color characteristic degree indicative of a similarity between a pixel color of a generated image to be predicted from the input images and a pre-designated designation color; and changing a weight for an edge amount of each pixel within the image to be generated, based on said designation color characteristic degree, and generating the image in which an area of said designation color differs from other areas in a manner of reproduction of edges.