Image Color Effect: Brightness, Contrast, Negative
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
import java.awt.image.ByteLookupTable;
import java.awt.image.LookupOp;
import java.awt.image.LookupTable;
import java.awt.image.ShortLookupTable;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.TitledBorder;
public class ColorApp extends JFrame {
DisplayPanel displayPanel;
JButton brightenButton, darkenButton, contrastIncButton, contrastDecButton,
reverseButton, resetButton;
public ColorApp() {
super();
Container container = getContentPane();
displayPanel = new DisplayPanel();
container.add(displayPanel);
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(3, 2));
panel
.setBorder(new TitledBorder(
"Click a Button to Perform the Associated Operation and Reset..."));
brightenButton = new JButton("Brightness >>");
brightenButton.addActionListener(new ButtonListener());
darkenButton = new JButton("Darkness >>");
darkenButton.addActionListener(new ButtonListener());
contrastIncButton = new JButton("Contrast >>");
contrastIncButton.addActionListener(new ButtonListener());
contrastDecButton = new JButton("Contrast <<");
contrastDecButton.addActionListener(new ButtonListener());
reverseButton = new JButton("Negative");
reverseButton.addActionListener(new ButtonListener());
resetButton = new JButton("Reset");
resetButton.addActionListener(new ButtonListener());
panel.add(brightenButton);
panel.add(darkenButton);
panel.add(contrastIncButton);
panel.add(contrastDecButton);
panel.add(reverseButton);
panel.add(resetButton);
container.add(BorderLayout.SOUTH, panel);
addWindowListener(new WindowEventHandler());
setSize(displayPanel.getWidth(), displayPanel.getHeight() + 25);
show();
}
class WindowEventHandler extends WindowAdapter {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
}
public static void main(String arg[]) {
new ColorApp();
}
class ButtonListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
JButton button = (JButton) e.getSource();
if (button.equals(brightenButton)) {
displayPanel.brightenLUT();
displayPanel.applyFilter();
displayPanel.repaint();
} else if (button.equals(darkenButton)) {
displayPanel.darkenLUT();
displayPanel.applyFilter();
displayPanel.repaint();
} else if (button.equals(contrastIncButton)) {
displayPanel.contrastIncLUT();
displayPanel.applyFilter();
displayPanel.repaint();
} else if (button.equals(contrastDecButton)) {
displayPanel.contrastDecLUT();
displayPanel.applyFilter();
displayPanel.repaint();
} else if (button.equals(reverseButton)) {
displayPanel.reverseLUT();
displayPanel.applyFilter();
displayPanel.repaint();
} else if (button.equals(resetButton)) {
displayPanel.reset();
displayPanel.repaint();
}
}
}
}
class DisplayPanel extends JPanel {
Image displayImage;
BufferedImage bi;
Graphics2D big;
LookupTable lookupTable;
DisplayPanel() {
setBackground(Color.black); // panel background color
loadImage();
setSize(displayImage.getWidth(this), displayImage.getWidth(this)); // panel
createBufferedImage();
}
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 createBufferedImage() {
bi = new BufferedImage(displayImage.getWidth(this), displayImage
.getHeight(this), BufferedImage.TYPE_INT_ARGB);
big = bi.createGraphics();
big.drawImage(displayImage, 0, 0, this);
}
public void brightenLUT() {
short brighten[] = new short[256];
for (int i = 0; i < 256; i++) {
short pixelValue = (short) (i + 10);
if (pixelValue > 255)
pixelValue = 255;
else if (pixelValue < 0)
pixelValue = 0;
brighten[i] = pixelValue;
}
lookupTable = new ShortLookupTable(0, brighten);
}
public void darkenLUT() {
short brighten[] = new short[256];
for (int i = 0; i < 256; i++) {
short pixelValue = (short) (i - 10);
if (pixelValue > 255)
pixelValue = 255;
else if (pixelValue < 0)
pixelValue = 0;
brighten[i] = pixelValue;
}
lookupTable = new ShortLookupTable(0, brighten);
}
public void contrastIncLUT() {
short brighten[] = new short[256];
for (int i = 0; i < 256; i++) {
short pixelValue = (short) (i * 1.2);
if (pixelValue > 255)
pixelValue = 255;
else if (pixelValue < 0)
pixelValue = 0;
brighten[i] = pixelValue;
}
lookupTable = new ShortLookupTable(0, brighten);
}
public void contrastDecLUT() {
short brighten[] = new short[256];
for (int i = 0; i < 256; i++) {
short pixelValue = (short) (i / 1.2);
if (pixelValue > 255)
pixelValue = 255;
else if (pixelValue < 0)
pixelValue = 0;
brighten[i] = pixelValue;
}
lookupTable = new ShortLookupTable(0, brighten);
}
public void reverseLUT() {
byte reverse[] = new byte[256];
for (int i = 0; i < 256; i++) {
reverse[i] = (byte) (255 - i);
}
lookupTable = new ByteLookupTable(0, reverse);
}
public void reset() {
big.setColor(Color.black);
big.clearRect(0, 0, bi.getWidth(this), bi.getHeight(this));
big.drawImage(displayImage, 0, 0, this);
}
public void applyFilter() {
LookupOp lop = new LookupOp(lookupTable, null);
lop.filter(bi, bi);
}
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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