//<pre>
import java.io.*;
import java.net.*;

import java.awt.*;
import java.awt.image.*;

/*
HOW TO USE THIS CLASS FROM AN APPLET:

--- HERE'S WHAT YOU PUT INTO THE HTML FILE: ----

      &lt;applet code=myAmazingApplet.class width=500 height=500&gt;
      &lt;param name=image value=http://myAmazingUrl.com/myAmazingImage.jpg&gt;
      &lt;/applet&gt;

--- HERE'S WHAT YOU PUT INTO THE APPLET JAVA CODE: ----

      String urlName = getParameter("image");
      buffer = new ImageBuffer(urlName, this);

      // HERE'S A REALLY TRIVIAL EXAMPLE OF SOMETHING TO DO WITH THE LOADED IMAGE.
      // YOU'LL PROBABLY WANT TO DO SOMETHING MORE INTERESTING - LIKE TEXTURE MAPPING.

      for (int y = 0 ; y &lt; buffer.height ; y++)
      for (int x = 0 ; x &lt; buffer.width  ; x++)
         pix[x + width * y] = buffer.get(x, y);
*/

public class ImageBuffer
{
   public int pixels[] = null, width = 0, height = 0;

   // CONSTRUCT A NEW IMAGE BUFFER BY LOADING FROM A FILE OR URL

   public ImageBuffer(String fileName, java.applet.Applet applet) {

      // GRAB AN IMAGE FROM A URL ON THE WEB OR FROM A FILE ON DISK

      Image image = null;

      try {
         if (fileName.length() >= 4 && fileName.substring(0,5).equals("http:"))
            image = applet.getImage(new URL(fileName));
         else
            image = Toolkit.getDefaultToolkit().getImage(new URL(applet.getCodeBase(),fileName));
      }
      catch (Exception e) { System.err.println(e); }

      // MOVE THE IMAGE INTO AN ARRAY OF PACKED R,G,B PIXELS

      try {
         MediaTracker mt = new MediaTracker(applet);
         mt.addImage(image, 1);
         mt.waitForAll();

         width  = image.getWidth (applet);
         height = image.getHeight(applet);
         pixels = new int[width * height];

         (new PixelGrabber(image, 0, 0, width, height, pixels, 0, width)).grabPixels();
      }
      catch (InterruptedException e) { }
   }

   // GET THE PACKED R,G,B VALUE AT ONE PIXEL OF THE IMAGE BUFFER

   public int get(int x, int y) { return pixels[x + width * y]; }

   // GET A SINGLE COLOR COMPONENT - RED, GREEN OR BLUE - FROM A PIXEL

   public int get(int x, int y, int c) { return get(x, y) >> 16-8*c & 255; }
}