in order to perform printing by using a minimum of band buffer and correcting bending / inclination in a sub - scanning direction without making optical adjustments and using special hardware , 1 - band image data are stored in the band buffer , images stored in the band buffer are corrected , images lying outside a band area are stored in an intermediate buffer , and images including images stored in the intermediate buffer and corrected images of a next band that lie inside the band area are output .