This program sharpens the image selected from the dropdown menu
using either unsharp masking or the Laplacian (see Chapter 5).
Unsharp masking does not amplify noise as much as the Laplacian.
Slides: σ=standard deviation of Gaussian for unsharp masking. Displayed: Original image, sharpened using: (a) unsharp masking; (b) Laplacian.