# SharpenShock node¶

This documentation is for version 2.0 of SharpenShock (net.sf.cimg.CImgSharpenShock).

## Description¶

Sharpen selected images by shock filters.

Uses ‘sharpen’ function from the CImg library.

CImg is a free, open-source library distributed under the CeCILL-C (close to the GNU LGPL) or CeCILL (compatible with the GNU GPL) licenses. It can be used in commercial applications (see http://cimg.eu).

## Inputs¶

Input Description Optional
Source   No
Amplitude / amplitude Double 0.6 Standard deviation of the spatial kernel, in pixel units (>=0). Details smaller than this size are filtered out.
Edge Threshold / edgeThreshold Double 0.1 Edge threshold.
Gradient Smoothness / alpha Double 0.8 Gradient smoothness (in pixels).
Tensor Smoothness / sigma Double 1.1 Tensor smoothness (in pixels).
Iterations / iterations Integer 1 Number of iterations. A reasonable value is 1.
(Un)premult / premult Boolean Off Divide the image by the alpha channel before processing, and re-multiply it afterwards. Use if the input images are premultiplied.
Invert Mask / maskInvert Boolean Off When checked, the effect is fully applied where the mask is 0.
Mix / mix Double 1 Mix factor between the original and the transformed image.