20 June 2005 IMAGE PROCESSING
6-31
Detailed
Descriptions
6.5.10 INDEPENDENT DOT ERASE
Independent dot erase (set with the SP mode settings listed in the table below)
remains in effect even when a “Custom Setting” is selected with the User Tools.
Independent dot erase targets for elimination random, irregular shaped black dots
on the surface of the original that would otherwise appear in the copy after
scanning and printing. The strength of the application of this feature can be
adjusted for each mode.
The filter compares each pixel with the pixels around an area 7 pixels x 7 lines. If
the sum of the pixels at the edges is smaller than the threshold value, the object
pixel is changed to zero (white). depending on the strength of the SP mode setting.
Setting a larger setting increases the number of dots erased, but if set too high, this
SP can also remove small or fine text characters or even portions of large text
characters.
Mode Independent Dot Erase Filter Default Range
Text SP4903 60 5
Text/Photo SP4903 62 0
Pale SP4903 63 0
Generation Copy SP4903 64 8
0 ~ 15
NOTE: The “0” setting switches off the filter.
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