public function getBase64Source(){
                $Fullpath = $this->owner->getFullPath();

                $cache = SS_Cache::factory('Base64Image');
                $cachekey = md5($Fullpath);
                if(!($Base64Image = $cache->load($cachekey))){
                    $Base64Image = base64_encode(file_get_contents($Fullpath));
                    $cache->save($Base64Image);
                }

                $type = strtolower($this->owner->getExtension());

                return "data:image/".$type.";base64,".$Base64Image;
        }