(PECL gmagick >= Unknown)
Gmagick::reducenoiseimage — Smooths the contours of an image
Smooths the contours of an image while still preserving edge information. The algorithm works by replacing each pixel with its neighbor closest in value. A neighbor is defined by radius. Use a radius of 0 and Gmagick::reduceNoiseImage() selects a suitable radius for you.
The radius of the pixel neighborhood.
The Gmagick object on success
Throws an GmagickException on error.