public function getImagePathPrivate() {
		//set default return
		$return = null;
		//set media path
		$sMediaPath = \Yii::$app->imagemanager->mediaPath;
		$sFileExtension = pathinfo($this->fileName, PATHINFO_EXTENSION);
		//get image file path
		$sImageFilePath = $sMediaPath . '/' . $this->id . '_' . $this->fileHash . '.' . $sFileExtension;
		//check file exists
		if (file_exists($sImageFilePath)) {
			$return = $sImageFilePath;
		}
		return $return;
	}