public function getPreviews($html)
    {
        $images = array_map(function ($url) {
            if ($url && !is_url($url)) {
                //If is relative path
                $url = Folder::isAbsolute($url) ? $url : WWW_ROOT . 'img' . DS . $url;

                if (!file_exists($url)) {
                    return false;
                }

                $thumber = new ThumbCreator($url);
                $thumber->resize(1200, 1200)->save(['format' => 'jpg']);
                $url = $thumber->getUrl();
            }

            list($width, $height) = $this->getPreviewSize($url);

            return new Entity(compact('url', 'width', 'height'));
        }, $this->extractImages($html));

        return array_filter($images);
    }