Imagick::crop

public function crop(Rectangle $source)
{
	if($this->image === null)
	{
		return false;
	}

	$this->image->setImagePage(0, 0, 0, 0);

	foreach ($this->image as $frame)
	{
		$frame->cropImage($source->getWidth(), $source->getHeight(), $source->getX(), $source->getY());
	}

	return true;
}