Fotoxx Sharpen Tools
1. Original image
2. Blurred image, blur radius 3
3. Unsharp Mask - a common method, very effective but prone to
creating "halos" around high-contrast edges.
4. Gradient - pixel
brightness gradients are steepened locally. Halo effect is
5. Kuwahara - strong edges are
made very sharp, weak edges are wiped out. No halos. Some loss of
6. Median Difference -
pixel brightness changed in proportion to brightness / (median
neighborhood brightness). No halos.