Confusion with Image/BufferedImage

Question

Hello,
I'm trying to write an applet that displays and modifies local image files (gif). I'm running into some confusion with the different image APIs and drawing methods though.
I want to read the files, display them, and then create new images from sections of the original ones. I wrote an applet that succesfully loads and displays files as Image objects, but then I saw that BufferedImage has a method getSubImage() that I thought I could use to create the new images.
But my problem is that even without manipulating the images, I can't get them to display as BufferedImages. Here's the code, where I try to display the series of images twice, once as Image, once as BufferedImage, but the BI come out as black squares.
public class myapplet extends Applet
     BufferedImage[] img = new BufferedImage[NUM_PICS];
     Image[] im = new Image[NUM_PICS];
     public void init()
          Toolkit t = Toolkit.getDefaultToolkit();
          Graphics2D bg;
          MediaTracker tracker = new MediaTracker (this);
          for(int i = 0;i<NUM_PICS;i++)
               try
                    im[i] = t.getImage(gen.getLogo());
//the getLogo method is from a class I wrote -
//it returns a string with a filename
               catch(Exception e)
                    System.out.println("ERROR: "+e.getMessage());
               img[i] = new BufferedImage(70, 70,BufferedImage.TYPE_INT_RGB);
bg = img[i].createGraphics();
bg.drawImage(im[i],0,0,this);
     public void paint(Graphics g)
          Graphics2D g2 = (Graphics2D)g;
          for(int i=0;i<NUM_PICS;i++)
               g.drawImage(im[i],10,i*70,this);
               g2.drawImage(img[i],null,80,i*70);
Any help would be great.

Answer 1

You have to use the MediaTracker before drawing the image onto the BufferedImage:
try {
im[i] = t.getImage(gen.getLogo());
tracker.addImage(im[i], i);
tracker.waitForID(i);