3 Document Quality
Wide Format Copy System User Guide
43
What is a good quality document?
4"
4"
Foreground
Background
A good quality document has all of these characteristics:
•
The contrast between the foreground (the image of interest) and the background is
high. 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 kind
of foreground (e.g., there are no pencil additions on a blueline). If the document is of
mixed type, the foreground is color.
•
If the document is white on black or white on blue, the foreground is clear white or
nearly 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. The
background density is uniform.
•
The document has no creases, folds, stains, tears or extraneous marks that the Scan
System 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 documents
degraded 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 are
light).
•
The foreground consists of two or more densities or colors (e.g., pencil additions on
an 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 Scan
System might interpret as foreground.
