(PECL imagick 2.0.0)
Imagick::getImageRegion — Extracts a region of the image
Extracts a region of the image and returns it as a new Imagick object.
width
The width of the extracted region.
height
The height of the extracted region.
x
X-coordinate of the top-left corner of the extracted region.
y
Y-coordinate of the top-left corner of the extracted region.
Extracts a region of the image and returns it as a new wand.
错误时抛出 ImagickException。