function assetImageDimensions($height = null, $width = null) {
        $imageDimensions = [];
        if ($height) $imageDimensions['height'] = $height;
        if ($width) $imageDimensions['width'] = $width;
        if (count($imageDimensions)) $this->data['assetImageDimensions'] = $imageDimensions;
        return $this;
    }