Coloring of designated image area and pinhole elimination by image scaling

摘要

An original image which is painted with at least first and second colors is subjected to a coloring process wherein a pixel block of MxN pixels in an original image is replaced by a representative pixel to generate a low density image. Then a subject image area is specified in the low density image, and the subject image area is painted with a desired color. The low density image is then magnified to form a high density image, and the high density image and the original image are compared with each other whereby another image is composed from the two images. Black image areas in the composed image area are finally changed to white. In the composed image, the desired color is allocated to pixels which have the desired color in the high density image and which are black in the original image while "white" is allocated to the other pixels. Pin holes, which are not specified as subject image areas, are not filed with the desired color, and are eliminated simultaneously when the subject image area is filled with the desired color.