protected function parse(array $sizes)
    {
        $images = [];

        foreach ($sizes as $slug => $properties) {
            list($width, $height, $crop, $label) = $this->parseProperties($properties, $slug);

            $images[$slug] = [
                'width' => $width,
                'height' => $height,
                'crop' => $crop,
                'label' => $label
            ];
        }

        return $images;
    }