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A-61527 May 2006 63
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. This option is only applied to binary images.
Polarity the host PC provides information to the scanner defining
whether the image should be stored in standard or reverse polarity. The
default polarity is Black on a White background. Reverse polarity is
White on a Black background.
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 the Noise Filter when scanning
documents with text smaller than 7-point type.
Noise Filter can be used with binary images only and is Front/Rear
independent. Choose None, Lone Pixel or Majority Rule.
• Lone Pixel reduces random noise on binary 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.
Black on White polarity White on Black polarity
No Noise Filter Used Lone Pixel