static void paintCenteredBackgroundImage(Component c, Graphics g, BufferedImage image) {
  paintCenteredBackgroundImage(c, g, image, c.getBackground());
}

static void paintCenteredBackgroundImage(Component c, Graphics g, BufferedImage image, Color backgroundColor) {
  int w = c.getWidth();  
  int h = c.getHeight();
  g.setColor(backgroundColor);
  g.fillRect(0, 0, w, h);
  if (image == null) ret;
  int iw = image.getWidth(), ih = image.getHeight();
  g.drawImage(image, (w-iw)/2, (h-ih)/2, c);
}