# SmoothGuided node¶

This documentation is for version 2.0 of SmoothGuided (net.sf.cimg.CImgGuided).

## Description¶

Blur image, with the Guided Image filter.

The algorithm is described in: He et al., “Guided Image Filtering,” http://research.microsoft.com/en-us/um/people/kahe/publications/pami12guidedfilter.pdf

Uses the ‘blur_guided’ 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
Radius / radius Integer 5 Radius of the spatial kernel (positional sigma), in pixel units (>=0).
Smoothness / epsilon Double 0.2 Regularization parameter. The actual guided filter parameter is epsilon^2).
Iterations / iterations Integer 1 Number of iterations.
(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.