/** Implements the Image/Zoom/Original Scale command. */
 public void unzoom() {
   double imag = imp.getWindow().getInitialMagnification();
   if (magnification == imag) return;
   srcRect = new Rectangle(0, 0, imageWidth, imageHeight);
   ImageWindow win = imp.getWindow();
   setDrawingSize((int) (imageWidth * imag), (int) (imageHeight * imag));
   setMagnification(imag);
   setMaxBounds();
   win.pack();
   setMaxBounds();
   repaint();
 }