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The sharpen tool is a port of unsharp mask from Mplayer. The parameters are the usual ones for unsharp masking, The "size" means the size of the blur, and the amount is how much of the blurred version gets subtracted.

See this tutorial that describes how to use

This page was last edited on 19 April 2013, at 09:44. Content is available under Creative Commons License SA 4.0 unless otherwise noted.