public function _crop()
	{
		$source      = ! empty($this->resource) ? $this->resource : $this->image->getPathname();
		$destination = $this->getResourcePath();

		$action = ' -crop ' . $this->width . 'x' . $this->height . '+' . $this->xAxis . '+' . $this->yAxis . ' "' . $source . '" "' . $destination . '"';

		$this->process($action);

		return $this;
	}