/**
     *  This constructor creates an Raster initialized
     *  with the contents of an image.
     */
    public Raster(Image img)
    {
        try {
            PixelGrabber grabber = new PixelGrabber(img, 0, 0, -1, -1, true);
            if (grabber.grabPixels()) {
                width = grabber.getWidth();
                height = grabber.getHeight();
                pixel = (int []) grabber.getPixels();
            }
        } catch (InterruptedException e) {
        }
    }