(PECL gmagick >= Unknown)
Gmagick::chopimage — Removes a region of an image and trims
Removes a region of an image and collapses the image to occupy the removed portion.
width
Width of the chopped area
height
Height of the chopped area
x
X origo of the chopped area
y
Y origo of the chopped area
The chopped Gmagick object
错误时抛出GmagickException.