(PECL imagick 2.0.0)
Imagick::edgeImage — Enhance edges within the image
本函数还未编写文档，仅有参数列表。
Enhance edges within the image with a convolution filter of the given radius. Use radius 0 and it will be auto-selected.
The radius of the operation.
Returns TRUE on success.
Throws ImagickException on error.