Image Processing: Brightness and Contrast
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
public class TRescaleOp extends JFrame {
DisplayPanel displayPanel;
JButton brightenButton, darkenButton,
contIncButton, contDecButton;
public TRescaleOp() {
super();
Container container = getContentPane();
displayPanel = new DisplayPanel();
container.add(displayPanel);
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(2, 2));
panel.setBorder(new TitledBorder(
"Click a Button to Perform the Associated Operation..."));
brightenButton = new JButton("Brightness >>");
brightenButton.addActionListener(new ButtonListener());
darkenButton = new JButton("Brightness <<");
darkenButton.addActionListener(new ButtonListener());
contIncButton = new JButton("Contrast >>");
contIncButton.addActionListener(new ButtonListener());
contDecButton = new JButton("Contrast <<");
contDecButton.addActionListener(new ButtonListener());
panel.add(brightenButton);
panel.add(darkenButton);
panel.add(contIncButton);
panel.add(contDecButton);
container.add(BorderLayout.SOUTH, panel);
addWindowListener(new WindowEventHandler());
setSize(displayPanel.getWidth(), displayPanel.getHeight() + 10);
show(); // Display the frame
}
class WindowEventHandler extends WindowAdapter {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
}
public static void main(String arg[]) {
new TRescaleOp();
}
class ButtonListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
JButton temp = (JButton) e.getSource();
if (temp.equals(brightenButton)) {
displayPanel.brighten = true;
displayPanel.changeOffSet();
System.out.println(displayPanel.offset + "=offset");
displayPanel.rescale();
displayPanel.repaint();
}
else if (temp.equals(darkenButton)) {
displayPanel.brighten = false;
displayPanel.changeOffSet();
System.out.println(displayPanel.offset + "=offset");
displayPanel.rescale();
displayPanel.repaint();
}
else if (temp.equals(contIncButton)) {
displayPanel.contrastInc = true;
displayPanel.changeScaleFactor();
System.out.println(displayPanel.scaleFactor + "=scaleF");
displayPanel.rescale();
displayPanel.repaint();
}
else if (temp.equals(contDecButton)) {
displayPanel.contrastInc = false;
displayPanel.changeScaleFactor();
System.out.println(displayPanel.scaleFactor + "=scaleF");
displayPanel.rescale();
displayPanel.repaint();
}
}
}
}
class DisplayPanel extends JPanel {
Image displayImage;
BufferedImage biSrc, biDest, bi;
Graphics2D big;
RescaleOp rescale;
float scaleFactor = 1.0f;
float offset = 10;
boolean brighten, contrastInc;
DisplayPanel() {
setBackground(Color.black);
loadImage();
setSize(displayImage.getWidth(this),
displayImage.getWidth(this));
createBufferedImages();
}
public void loadImage() {
displayImage = Toolkit.getDefaultToolkit().getImage("largeJava2sLogo.jpg");
MediaTracker mt = new MediaTracker(this);
mt.addImage(displayImage, 1);
try {
mt.waitForAll();
} catch (Exception e) {
System.out.println("Exception while loading.");
}
if (displayImage.getWidth(this) == -1) {
System.out.println("No jpg file");
System.exit(0);
}
}
public void createBufferedImages() {
biSrc = new BufferedImage(displayImage.getWidth(this),
displayImage.getHeight(this),
BufferedImage.TYPE_INT_RGB);
big = biSrc.createGraphics();
big.drawImage(displayImage, 0, 0, this);
biDest = new BufferedImage(displayImage.getWidth(this),
displayImage.getHeight(this),
BufferedImage.TYPE_INT_RGB);
bi = biSrc;
}
public void changeOffSet() {
if (brighten) {
if (offset < 255)
offset = offset+5.0f;
}
else {
if (offset > 0)
offset = offset-5.0f;
}
}
public void changeScaleFactor() {
if (contrastInc) {
if (scaleFactor < 2)
scaleFactor = scaleFactor+0.1f;
}
else {
if (scaleFactor > 0)
scaleFactor = scaleFactor-0.1f;
}
}
public void rescale() {
rescale = new RescaleOp(scaleFactor, offset, null);
rescale.filter(biSrc, biDest);
bi = biDest;
}
public void update(Graphics g) {
g.clearRect(0, 0, getWidth(), getHeight());
paintComponent(g);
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2D = (Graphics2D) g;
g2D.drawImage(bi, 0, 0, this);
}
}
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