Transparent BufferedImage

    private BufferedImage getImage(BufferedImage src, float alpha)
    {
        BufferedImage dest = new BufferedImage(src.getWidth(), src.getHeight(),
                                               BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2 = dest.createGraphics();
        int rule = AlphaComposite.SRC_OVER;
        AlphaComposite ac = AlphaComposite.getInstance(rule, alpha);
        g2.setComposite(ac);
        g2.drawImage(src, null, 0, 0);
        g2.dispose();
        return dest;
    }