1. In a system for processing document images, a method for antialiasing at least one input image to provide an antialiased image, comprising the steps of: receiving the input image; processing said received input image by operation of an antialiasing filter to create an antialiased image, the antialiasing filter operation including the steps of: (1) determining one or more regions within the received image, (2) upon detecting at least one region containing a background image level that adjoins an image object having pixel values in a range other than a predetermined range of limit values, setting the pixel values of edge pixels in the image object to be substantially the same value; and outputting the antialiased image.