How to store jpeg image ?

Question

I am modifying the pixel of a jpeg image using pixel grabber function and storing it using the code give below
FileOutputStream fos = new FileOutputStream("out.jpg");
JPEGImageEncoder jpeg = JPEGCodec.createJPEGEncoder(fos);
jpeg.encode(image);
fos.close();
but when i open the image using paint or any other image viewing s/w i see the image whith brown shade
also when i again perform the revese operation to get the orignal pixel value i am unable to get the orginal pixel value .

Answer 1

Gif works for me. Just remember that gif uses a indexed color model. Demo:
import java.awt.*;
import java.awt.image.*;
import java.io.*;
import java.util.*;
import javax.imageio.*;
import javax.swing.*;
public class LoselessExample {
    public static void main(String[] args) throws IOException {
        int SIDE = 300;
        BufferedImage im1 = new BufferedImage(SIDE,SIDE, BufferedImage.TYPE_BYTE_INDEXED);
        WritableRaster raster1 = im1.getRaster();
        DataBufferByte  db1 = (DataBufferByte) raster1.getDataBuffer();
        byte[] data1 = db1.getData();
        new Random().nextBytes(data1);
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        ImageIO.write(im1, "gif", out);
        ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
        BufferedImage im2 = ImageIO.read(in);
        WritableRaster raster2 = im2.getRaster();
        DataBufferByte  db2 = (DataBufferByte) raster2.getDataBuffer();
        byte[] data2 = db2.getData();
        boolean success = Arrays.equals(data1, data2);
        System.out.println("success = " + success);
        JPanel p = new JPanel();
        p.add(new JLabel(new ImageIcon(im1)));
        p.add(new JLabel(new ImageIcon(im2)));
        JFrame f = new JFrame("LoselessExample");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setContentPane(p);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
}