(PECL imagick 2.0.0)
Imagick::reduceNoiseImage — Smooths the contours of an image
本函数还未编写文档，仅有参数列表。
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.
Throws ImagickException on error.