1. A method implemented on a user interface incorporated in a computer system coupled with a scanner for performing a scan operation on an original document, the computer system running a scanner driver and an application program ; , the method comprising the steps of: determining a set of image processing settings required for the original document by a scanner driving program; obtaining a primitive scanned image in a manner that the scanner uses the image processing settings through the scanner driving program; performing an image-enhancement process on the primitive scanned image, wherein the image-enhancement process includes an automatic cutting routine; and obtaining a final image by the image-enhancement process, wherein the final image is transferred to the application program.