private Image createThumbnail(Image image) {
  int sourceWidth = image.getWidth();
  int sourceHeight = image.getHeight();
 
  int thumbWidth = 64;
  int thumbHeight = -1;
 
  if (thumbHeight == -1)
    thumbHeight = thumbWidth * sourceHeight / sourceWidth;
 
  Image thumb = Image.createImage(thumbWidth, thumbHeight);
  Graphics g = thumb.getGraphics();
 
  for (int y = 0; y < thumbHeight; y++) {
    for (int x = 0; x < thumbWidth; x++) {
      g.setClip(x, y, 1, 1);
      int dx = x * sourceWidth / thumbWidth;
      int dy = y * sourceHeight / thumbHeight;
      g.drawImage(image, x - dx, y - dy,
          Graphics.LEFT | Graphics.TOP);
    }
  }
 
  Image immutableThumb = Image.createImage(thumb);
 
  return immutableThumb;
}