Image loses quality when loaded in Java

Question

Images seem to lose quality when you load them in Java. Try this out to see what I mean... test_out.jpg is smaller than test_in.jpg
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
public class ImageTest
    public static void main (String args [])
        BufferedImage img = ImageIO.read (new File ("test_in.jpg"));
        ImageIO.write (img, "JPG", new File ("test_out.jpg"));
}Is there any way around this? I need to manipulate the image in Java, so I can't just input and output the bytes of the file.

Answer 1

Well, it's basically cutting the file in half... 1.69
MB to 862 KB. Doing the same thing in C# keeps the
file size 1.69 MB (no quality lost), but I want to
use Java because it's easier to manipulate pictures
in Java. 800 KB seems a little extreme...There is a lot of difference between no size loss in a file and "no quality loss". Each time you JPG something, some quality is lost even it the size of the file that results is the same as before--it's in the JPS algorithm for comprssion.