GIMP tools - BDA

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Enhance filters
The filters of this group enhance the general view of the image, remove various noises,
spots, red-eye effect.
Unsharp mask
This filter sharpens the image in a certain way. It should be noted that the sharpness of
the image is not enhanced for a full image at once but by sharpening its borders,
silhouettes and contours. For example, we have an image picturing a man with a rather
dim silhouette. By applying this filter only the man's silhouette is sharpened.
How to use this filter?
1. Open an image;
2. Select FiltersEnhanceUnsharp Mask command. Once the Unsharp Mask
dialog box opens, set the parameters
The sharpness of the silhouette edges results by blurring the areas of the image
behind the silhouette edges. The higher the Radius value, the larger the distance
of the blur from the silhouette edges. By increasing the value, we increase the
number of blurred adjacent areas;
The Amount parameter controls sharpness. The higher the value, the sharper
the contour borders;