Figure 1 shows the sharpen plug-in window. The scrollbars allow you to pan within the image (in this case to the back of the duck in the foreground). The preview window shows the filter output using the current settings.

The Sharpness control selects the amount of sharpening to apply, from 1 to 99 percent. Higher values make the edges in the image increasing distinct.

Figure 1 - The sharpen plug-in window

The sharpen plug-in can restore some of the lost detail in a despeckled image. The image in Figure 4 was sharpened by 50%.

The feathers on the duck in the foreground were enhanced effectively by the filter. A contrast adjustment might bring the sharpened image even closer to the original.

Figure 2 - Original image

Figure 3 - Despeckled image

Figure 4 - Sharpened image (50%)