public function render($request_path) {

        // Get crop path relative to it's dir
        $crop_path = $this->url->relativePath($request_path);

        // If the crops_dir is a remote disk and if the crop has already been
        // created.  If it has, just return that path.
        if ($this->storage->cropsAreRemote()
            && $this->storage->cropExists($crop_path)) {
            return $crop_path;
        }

        // Parse the path.  In the case there is an error (the pattern on the route
        // SHOULD have caught all errors with the pattern) just return
        if (!$params = $this->url->parse($request_path)) return;
        list($path, $width, $height, $options) = $params;

        // Check if there are too many crops already
        if ($this->storage->tooManyCrops($path)) throw new Exception('Croppa: Max crops');

        // Increase memory limit, cause some images require a lot to resize
        if ($this->config['memory_limit'] !== null) {
            ini_set('memory_limit', $this->config['memory_limit']);
        }

        // Build a new image using fetched image data
        $image = new Image(
            $this->storage->readSrc($path),
            $this->url->phpThumbConfig($options)
        );

        // Process the image and write its data to disk
        $this->storage->writeCrop($crop_path,
            $image->process($width, $height, $options)->get()
        );

        // Return the paht to the crop, relative to the storage disk
        return $crop_path;
    }