Java - Aumentar o disminuir tamaño de imagen con slider

public class ShowImage extends JPanel {

	BufferedImage image;

	/* */

	ShowImage(BufferedImage img) {

		super();

		this.image = img;

		setLayout(new BorderLayout(2, 2));

		final JSlider jsl = new JSlider(JSlider.HORIZONTAL, 50, 100, 100);

		jsl.setMajorTickSpacing(10);

		jsl.setMinorTickSpacing(5);

		jsl.setPaintTicks(true);

		jsl.setPaintLabels(true);

		add(jsl, BorderLayout.NORTH);

		final JComponent imgview = new JComponent() {

			/* */

			@Override

			public Dimension getPreferredSize() {

				return new Dimension(image.getWidth(), image.getHeight());

			}

			/* */

			@Override

			public void paintComponent(Graphics g) {

				int scale = jsl.getValue();

				int nw = image.getWidth() * scale / 100;

				int nh = image.getHeight() * scale / 100;

				int origx = (image.getWidth() - nw) / 2;

				int origy = (image.getHeight() - nh) / 2;

				g.drawImage(image, origx, origy, nw, nh, null);

			}

		};

		add(imgview, BorderLayout.CENTER);

		jsl.addChangeListener(new ChangeListener() {

			@Override

			public void stateChanged(ChangeEvent e) {

				if(!jsl.getValueIsAdjusting()) {

					imgview.repaint();

				}

			}

		});

	}

	/* */

	public static void main(String args[]) throws IOException {

		File ImageFile = new File("/tmp/Shelby_GT500KR_at_NYIAS.jpg");

		BufferedImage bimg = ImageIO.read(ImageFile);

		JFrame fr = new JFrame("Image test");

		fr.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		fr.setContentPane(new ShowImage(bimg));

		fr.pack();

		fr.setVisible(true);

	}

}