1. An image processing method, comprising: configuring a plurality of designation colors; receiving a plurality of images as inputs; calculating, for each of the plurality of designation colors, 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 each 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 for each of the plurality of designation colors, and generating the image in which an area of each designation color differs from other areas in a manner of reproduction of edges.