Scanner User's Guide

A-61560 June 2006 79
• Invert Image  defines whether the image should be stored in black
on a white background or white on a black background. The default is
Black on White. If you want white on a black background, check this
option.
• Add Border — allows you to add a fixed amount of border to the left,
right, top and bottom edge of the image.
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 black and white images only and is Front/
Back independent. Choose None, Lone Pixel or Majority Rule.
• Lone Pixel: reduces random noise on black and white 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 White on Black
No Noise Filter Used Lone Pixel