如何在JFrame上正确显示PNG

Question

How would I go about displaying a png with transparent parst on JFrame.
I currently have this code and all is good, but it displays the transparent parts grey!

private static void createAndShowSplashScreen() throws Exception {
    Image image = ImageIO.read(TCPServer.class
            .getResource("images/splash.png"));
    BufferedImage img = (BufferedImage) image;

    frame = new JFrame("Splash");
    frame.setUndecorated(true);
    frame.add(new JLabel(new ImageIcon(image)) {
        {
            setOpaque(false);
        }
    });
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setPreferredSize(new Dimension(img.getWidth(), img.getHeight()));
    frame.setBounds((int) (java.awt.Toolkit.getDefaultToolkit()
            .getScreenSize().getWidth() / 2 - img.getWidth() / 2),
            (int) (java.awt.Toolkit.getDefaultToolkit().getScreenSize()
                    .getHeight() / 2 - img.getHeight() / 2),
            img.getWidth(), img.getHeight());
    frame.setOpacity(0f);
    frame.setMinimumSize(frame.getPreferredSize());
    frame.setVisible(true);
}

THX for the help! Sincerely Roberto!

EDIT: IMG

PROBLEM SOLVED:

Image image = ImageIO.read(TCPServer.class
            .getResource("images/splash.png"));
    BufferedImage img = (BufferedImage) image;

    frame = new JFrame("Splash");
    frame.setUndecorated(true);
    frame.add(new JLabel(new ImageIcon(image)) {
        {
            setOpaque(false);
        }
    });
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setPreferredSize(new Dimension(img.getWidth(), img.getHeight()));
    frame.setBounds((int) (java.awt.Toolkit.getDefaultToolkit()
            .getScreenSize().getWidth() / 2 - img.getWidth() / 2),
            (int) (java.awt.Toolkit.getDefaultToolkit().getScreenSize()
                    .getHeight() / 2 - img.getHeight() / 2),
            img.getWidth(), img.getHeight());
    RoundRectangle2D r = new RoundRectangle2D.Double(0, 0, img.getWidth(), img.getHeight(), 25, 25);
    frame.setShape(r);
    frame.setOpacity(0f);
    frame.setMinimumSize(frame.getPreferredSize());
    frame.setVisible(true);

Answer 1

I do not know if this suits your particular case but how about changing the shape of the JFrame to match the image ? The setShape(Shape shape) lets you use any shape from the geom package. I see that this is a splash screen and will be undecorated, probably, so setting the shape should do the trick.