Microtek ScanMaker 6400XL Reference Manual page 93

Blur filters eliminate noise in the parts of the image where
significant color transitions occur. The filter decreases the
contrast between adjacent pixels, making the image appear
hazy and out of focus
• Blur smooths out the transitions by lightening pixels next to
the hard edges of defined lines and shaded areas
• Blur More produces an effect three or four times stronger
than Blur
Original
The Custom filter changes the
brightness values of each pixel in
the image according to a predefined
algorithm known as convolution.
This filter allows you to define a 3x3
or 5x5 mask size custom filter (see
dialog box next page for details)
Gaussian Blur filter is used to blur
or defocus the area of an image
where significant color transitions
occur, or noise exists. "Gaussian"
refers to the bell-shaped curve that
is generated when this filter adjust
the color values of the affected
pixels. This filter produces a hazy
effect (see dialog box in the
following pages for details)
Sharpen and Sharpen More filters do the
opposite of the Blur filters and increase the contrast
of adjacent pixels, making images appear sharper
and more focused. Both filters improve clarity. The
Sharpen More filter has a stronger sharpening
effect than Sharpen filter.
Original
Blur
Sharpen Sharpen More
Edge Enhancement filter gives
greater contrast to edges. The filter
can do this because edges usually
are the areas in an image where gray
or color levels change abruptly. It is
best to use this tool for improving
geometrical contouring shape
Blur More
Unsharp Masking (USM) filter is used
to adjust the contrast of edge detail,
creating the illusion of more image
sharpness. This filter is used for
refocusing an image that has become
blurry from interpolation or scanning. It is
an essential tool for doing CMYK color
separation. In general, unsharp mask is
needed to make a good sharpness color
reproduction, especially when you want
to make a large color reproduction from a
small original (see dialog box in the
following pages for details)
Reference: The Settings Window
Original
Enhancement
Emboss filter makes a selection
appears engraved or stamped
by suppressing the color within
the selection and then tracing its
edges with dark shadow
Original Emboss
Edge
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