A image processing method of smoothing treatment for the boundary area of the image area periphery is a executed image processing method in the image processing system including a storage, storing program, image to be processed, processor and the executive stored program. The method is as to search out at least one image area with the predetermined character from the image according to detecting method of the predetermined image area, the position out the boundary area with the positioning method of predetermined boundary area, to adjust the picture element in each image area with the adjustment method of the predetermined color parameter, to make different but similar color parameter adjustment to the picture element in the boundary area of image area periphery with the predetermined smoothing method to make the color parameter adjustment of each image area.