Unsharp Masking Filter - Microtek ArtixScan 4500t Reference Manual

Unsharp Masking filter

The Unsharp Masking filter adjusts the contrast of edge detail and creates the
illusion of more image sharpness. This filter can be useful for refocusing an
image that has become blurry from interpolation or scanning. The dialog box
below appears when you choose Unsharp Masking from the Filters menu.
Specifiy the
degree of the
filter's effect
here. The higher
the value, the
stronger the
sharpening
effect of the
filter. Too much
Unsharp Masking
will emphasize
the noise in the
image
This parameter specifies a tolerance
range to prevent overall sharpening
that might generate noise or cause
unexpected results.
The Threshold defines the required
range of contrast between adjacent
pixels before Unsharp Masking is
applied. Only the pixels with the
range of contrast between adjacent
pixels before sharpening is applied to
an edge. A lower Threshold value
produces a more pronounced effect.
Original Unsharp Masking 3x3 mask
Reference: The Advanced Image Correction tools
This parameter pertains to how the Unsharp
Masking filter affects pixels which are lighter
than their adjacent pixels. By default, a value of
60 is specified for this field. The higher the
value, the lighter the edge around the darker
areas and the more pronounced the Unsharp
Masking effect is.
size
This parameter determines
the depth of surrounding
pixels that will be affected.
The larger the mask size,
the stronger the sharpening
effect of the filter.
This parameter pertains to how
the Unsharp Masking filter
affects pixels which are darker
than their adjacent pixels. By
default, a value of 100 is
specified for this field. The
higher the value, the darker the
edge around the lighter areas
and the more pronounced the
Unsharp Masking effect is.
Unsharp Masking 5x5 mask
size
107