Xerox 8855 用户手册
XES Synergix 8825/8830/8850/8855 Digital Solution User Guide
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Document quality (continued)
Determining document quality
Some documents require additional adjustments to obtain the best copy
quality. Documents of good quality are easy to scan and usually give good
copies on the first attempt. Documents of bad quality may require more than
one attempt, using different settings, to obtain the best copy quality.
quality. Documents of good quality are easy to scan and usually give good
copies on the first attempt. Documents of bad quality may require more than
one attempt, using different settings, to obtain the best copy quality.
What is a good quality document?
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 ablueline). If the document is of mixed type, the foreground
is color.
uniform. There is only one kind of foreground (e.g., there are no pencil
additions on ablueline). 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.
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 Scanner might interpret as foreground.
What is a bad quality document?
Bad quality documents often require special attention to achieve a usable
image. Fortunately, the Synergix Digital Solution incorporates special image
processing technology that can extract acceptable images from documents
degraded by many kinds of problems.
image. Fortunately, the Synergix Digital Solution incorporates special image
processing technology 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 background has variable density.
• The background has speckles.
• The document has creases, folds, stains, tears, or extraneous marks that
the Scanner might interpret as foreground.
4"
4"
Foreground
Background