1. In a system for processing document images including both text/line art regions, and pictorial regions, a method for antialiasing segments of the image, including the steps of: receiving the document image; applying an anti-aliasing filter to text/line art regions within the image, to modify the image in a manner that suppresses aliasing effects; coincidentally identifying those pixels modified by the antialiasing filter; and providing a digital tag including at least a single bit of information for the identified pixels, said digital tag being detectable in a subsequent processing operation.