Moo0 ImageSharpener is a free application that allows you to easily sharpen or obscure your images. The program is very easy to use, you just need to drag and drop the image file into the interface of Moo0 ImageSharpener, choose to sharpen or blur and can adjust the level in Advanced Options. With this software, you will not need to launch large applications to perform these operations.
(according to Softpedia)