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F. Sharpen (Unsharp Masking)
The Sharpen 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 Sharpen from the Filters menu.
Enter a value (0-100) in the
Strength edit box (or drag the
slider) to specify the degree of
the filter's effect.
The higher the value, the
stronger the sharpening effect
of the filter. Too much sharpen
will emphasize the noise in the
image.
Enter a value (0-255) in the Threshold edit box
(or drag the slider).
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
Sharpen 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.
Select a mask size from the Mask Size
list box.
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.
Enter a value (0-100) in the Dark edit box
(or drag the slider).
This parameter pertains to how the
Sharpen 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.
Enter a value (0-60) in the Light edit box
(or drag the slider).
This parameter pertains to how the
Sharpen 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 Sharpen effect is.
ScanWizard Industry Reference Manual
41
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