Java Square BufferedImage

public static BufferedImage Square(BufferedImage img) {
    int w = img.getWidth();
    int h = img.getHeight();

    BufferedImage main = null;
    boolean isWidth = false;

    if (w > h) {
        main = new BufferedImage(w, w, BufferedImage.TYPE_INT_ARGB);
        isWidth = true;
    } else if (h > w) {
        main = new BufferedImage(h, h, BufferedImage.TYPE_INT_ARGB);
        isWidth = false;
    }

    Graphics g = main.getGraphics();
    {
        g.setColor(Color.white);
        g.fillRect(0, 0, main.getWidth(), main.getHeight());

        int x = 0, y = 0;

        if (isWidth) {
            g.drawImage(img, x, (main.getHeight()/2) - (img.getHeight()/2), null);
        } else {
            g.drawImage(img, (main.getWidth()/2) - (img.getWidth()/2), y, null);
        }

    }
    g.dispose();

    return main;
}