A method of reducing image storage space in Java (converting to jpg format)

    The BufferedImage object is mainly used to save the original image in jpg format:

public static void thumbImage(String input,String newFile) throws Exception {
		Image src = javax.imageio.ImageIO.read(new File(input));
		int width = src.getWidth(null);// 获取图源宽度
		int height = src.getHeight(null);// 获取图源高度
		BufferedImage thumb = new BufferedImage(width / 1, height / 1, 
				BufferedImage.TYPE_INT_RGB);
		// 绘制缩小后的图
		thumb.getGraphics().drawImage(src, 0,  0, width / 1, height / 1, null);
		File file = new File(newFile);// 输出到文件流
		ImageIO.write(thumb, "jpg", file);
}

    What is the effect of use: the original image is -1947K, and the converted image is -716K. The effect seems to be more obvious, and the difference in image quality is not too big.