(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.
Throws ImagickException on error.