With this function, you can set the sharpness of the scanned image accurately.
1. Press at the toolbar, and a list will pop up.
2. Click on the filter degree you need. If you choose "Unsharp Mask", such a dialog box will pop up:
3. Drag the scroll bar to adjust the sharpness:towards the left, the amount will be decreased and the image will be blurred;towards the right, the image will be sharpened.
4. Press the "OK" button to save your setting and close this dialog box.