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Amount
The amount determines what percentage of change will occur. The
default setting is 50 percent. Increase up to 100; decrease down to 1. A higher
percentage makes the effect stronger.
Radius
The radius determines the depth of pixels that are affected at the edge
you’re changing. The default setting is 25 pixels. Increase up to 100; decrease
down to 0.1. A larger radius causes more of the pixels surrounding the edge
pixels to be sharpened.
Threshold
Threshold determines the level of brightness to be used for
differentiation. The default setting is 0 levels. Increase up to 25. A lower value
produces a more pronounced effect.
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Editing Scanned Images
Amount 50
Radius 25
Threshold 0
Amount 75
Radius 75
Threshold 0
Amount 100
Radius 50
Threshold 1
Amount 100
Radius 100
Threshold 25