Making a composite of 2 images, it lose all the colors

Question

Hello, Thanks for reading me.
I'm trying to make a composite of 2 images (link_down, link_top) and when I'm making the composite it lose all the colors, I don't know why, please can anybody help me?
here are the images:
down= http://img234.imageshack.us/img234/9571/87453416io0.jpg
top= http://img71.imageshack.us/img71/7305/otraft7.png
output= http://img229.imageshack.us/img229/7796/outputjn0.jpg
and here is the code, please someone could help me?
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
public class ImageMaker {
     public static BufferedImage rotate(BufferedImage img, int angle) throws Exception{
          int w = img.getWidth();
          int h = img.getHeight();
          BufferedImage img2=ImageIO.read(new File("/tmp/top.png"));
          BufferedImage dimg = new BufferedImage(w, h, img.getType());
          Graphics2D g = dimg.createGraphics();
          g.drawImage(img, null, 0, 0);
          g.drawImage(img2,null, 20, 20);
          ImageIO.write(dimg, "jpg", new File("/tmp/output.jpg"));
          return dimg;
     public static BufferedImage createImage() {
          BufferedImage img = new BufferedImage(100, 100, BufferedImage.TYPE_INT_RGB);
          img.createGraphics();
          Graphics2D g = (Graphics2D)img.getGraphics();
          g.setColor(Color.YELLOW);
          g.fillRect(0, 0, 100, 100);
          for(int i = 1; i < 49; i++) {
               g.setColor(new Color(5*i, 5*i, 4+1*2+i*3));
               g.fillRect(2*i, 2*i, 3*i, 3*1);
          return img;
     public static void main(String[] args) {
          JFrame frame = new JFrame("Image Maker");
          frame.addWindowListener(new WindowAdapter() {
               public void windowClosing(WindowEvent event) {
                    System.exit(0);
          try{
          BufferedImage a=ImageIO.read(new File("/tmp/down.jpg"));
          frame.setBounds(0, 0, 200, 200);
          //JImagePanel panel = new JImagePanel(createImage(), 50, 45);
          JImagePanel panel = new JImagePanel(rotate(a,30), 50, 45);
          frame.add(panel);
          frame.setVisible(true);
          }catch(Exception e)
               System.out.println("Salida:"+e.toString());
import java.awt.Graphics;
//import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import javax.swing.JPanel;
public class JImagePanel extends JPanel{
     private BufferedImage image;
     int x, y;
     public JImagePanel(BufferedImage image, int x, int y) {
          super();
          this.image = image;
          this.x = x;
          this.y = y;
     @Override
     protected void paintComponent(Graphics g) {
          super.paintComponent(g);
          g.drawImage(image, x, y, null);
}

Answer 1

Try replacing
BufferedImage dimg = new BufferedImage(w, h, img.getType());with
BufferedImage dimg = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);Looks like your "down"-image is grayscale, and therefore also dimg.