关于ImageIO.read（write）改变图像大小，丢失了分辨率dpi

[清风皓月里]

1.jpg有900K，经过如下处理得到2.jpg 只有100K了，请教下为什么

public static void dealImage2(){
		Image img = null;
		try {
			img = ImageIO.read(new File("D:\\1.jpg"));
		} catch (IOException e) {
			e.printStackTrace();
		}
		
		try {
			ImageIO.write(toBufferedImage(img), "jpg", new File("D:\\2.jpg"));
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

[疯癫行者]

也许这个有帮助.
https://blog.csdn.net/wxh_xdk/article/details/79145726
https://blog.csdn.net/x137671/article/details/49071093