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A-61510 January 2005 3-9
Noise Filter occasionally small dots or specks appear in the
background of a scanned image. These specks increase file
compression size and usually contain no image information. Using the
Noise Filter on documents containing very fine detail (e.g., the dot on an
"i" in 4-point type) may cause information to be lost. It is recommended
that you do not use Noise Filter when scanning documents with text
smaller than 7-point type.
Noise Filter can be used with bi-tonal images only and is front/rear and
dual stream independent. Choose None, Lone Pixel or Majority Rule.
• Lone Pixel reduces random noise on bi-tonal images by converting
a single black pixel surrounded by white to white or by converting a
single white pixel surrounded by black to black.
• Majority Rule sets the central pixel value in a matrix according to
the majority of white or black pixels in a matrix.
No Noise Filter Used Remove Lone Pixel
Image Filter used to enhance images containing dot matrix text
and/or images printed with shaded or colored backgrounds using
halftone screens. This filter effectively eliminates noise caused by the
halftone screen. Choose None or Halftone Removal.
• Halftone Removal used to enhance images containing dot matrix
text and/or images with shaded or colored backgrounds using
halftone screens. This filter effectively eliminates noise caused by
the halftone screen.