Yii2 - render image

In controller class

    
    public function actionIndex()
    {
        $response = Yii::$app->getResponse();
        $response->headers->set('Content-Type', 'image/jpeg');
        $response->format = Response::FORMAT_RAW;
        $response->stream = fopen(Yii::getAlias('@app/web/picture.jpg'), 'r');
        $response->send();
    }