3 Document QualityWide Format Copy System User Guide 43What is a good quality document?4" 4"ForegroundBackgroundA good quality document has all of these characteristics:• The contrast between the foreground (the image of interest) and the background ishigh. The foreground may be color or black.• The foreground is a solid, high-density black or dark color (or dark blue on a blueline,or dark brown on a sepia). The foreground density is uniform. There is only one kindof foreground (e.g., there are no pencil additions on a blueline). If the document is ofmixed type, the foreground is color.• If the document is white on black or white on blue, the foreground is clear white ornearly white, and the background is a solid, high-density black or dark color.• The background is white or light-colored and is free of speckling or other noise. Thebackground density is uniform.• The document has no creases, folds, stains, tears or extraneous marks that the ScanSystem might interpret as foreground.What is a bad quality document?Bad quality documents often require special attention to achieve a usable image. Fortunately,image processing technology is incorporated that can extract acceptable images from documentsdegraded by many kinds of problems.A bad quality document has one or more of the following problems:• The foreground is light (e.g., a faded or overexposed blueprint or light pencil lines).• The foreground has variable density (i.e., some parts are dark and some parts arelight).• The foreground consists of two or more densities or colors (e.g., pencil additions onan ink drawing, or pencil or ink additions on a sepia).• The background is medium dark or dark (e.g., underexposed blueprint).• The background has variable density.• The background has speckles.• The document has creases, folds, stains, tears, or extraneous marks that the ScanSystem might interpret as foreground.
