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Unsharp Mask
This Paint.NET plugin can apply an unsharp filter to all the edges in an image....
modify modifier unsharp mask unsharpen image unsharpen picture
Local Adaptive Unsharp Mask
Local Adaptive Unsharp Mask is a technique that helps bringing out a lot of detail hidden in low contrast images....
unsharp mask unsharp contrast mask adaptive Adaptive algorithm
ImageEffects
It is designed specifically for web server use which means it is both multithreaded and exceptionally fast....