code: public static void writeJpg(Image image, OutputStream out) throws IORuntimeException {
  		write(image, IMAGE_TYPE_JPG, out);
  	}
docs: 写出图像为JPG格式
  
  @param image {@link Image}
  @param out 写出到的目标流
  @throws IORuntimeException IO异常
  @since 4.0.10