(No version information available, might be only in CVS)
Imagick::reduceNoiseImage — Smooths the contours of an image
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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 Imagick::reduceNoiseImage() selects a suitable radius for you.
Returns TRUE on success.