Saving a Java 2d graphics image as .png file

by 
JPanel dPanel;
...     
public void save()
{
    BufferedImage bImg = new BufferedImage(dPanel.getWidth(), dPanel.getHeight(), BufferedImage.TYPE_INT_RGB);
    Graphics2D cg = bImg.createGraphics();
    dPanel.paintAll(cg);
    try {
            if (ImageIO.write(bImg, "png", new File("./output_image.png")))
            {
                System.out.println("-- saved");
            }
    } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
    }
}

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