Image Color Gray Effect : Image « 2D Graphics GUI « Java

Image Color Gray Effect

Image Color Gray Effect

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.color.ColorSpace;
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.ColorConvertOp;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.border.TitledBorder;

public class ColorConvertDemo extends JFrame {
  ColorPanel displayPanel;

  JButton grayButton, resetButton;

  public ColorConvertDemo() {
    Container container = getContentPane();

    displayPanel = new ColorPanel();

    JPanel panel = new JPanel();
    panel.setLayout(new GridLayout(1, 2));
    panel.setBorder(new TitledBorder(
        "Click the Gray Scale Button to Create Gray Scale Image..."));

    grayButton = new JButton("Gray Scale");
    grayButton.addActionListener(new ButtonListener());
    resetButton = new JButton("Reset");
    resetButton.addActionListener(new ButtonListener());


    container.add(BorderLayout.SOUTH, panel);

    addWindowListener(new WindowEventHandler());

    setSize(displayPanel.getWidth(), displayPanel.getHeight() + 15);

  class WindowEventHandler extends WindowAdapter {
    public void windowClosing(WindowEvent e) {

  public static void main(String arg[]) {
    new ColorConvertDemo();

  class ButtonListener implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      JButton button = (JButton) e.getSource();

      if (button.equals(grayButton)) {
      } else if (button.equals(resetButton)) {

class ColorPanel extends JLabel {
  Image displayImage;

  BufferedImage bi;

  Graphics2D big;

  ColorPanel() {
    setSize(displayImage.getWidth(this), displayImage.getWidth(this));


  public void loadImage() {
    displayImage = Toolkit.getDefaultToolkit().getImage(
    MediaTracker mt = new MediaTracker(this);
    mt.addImage(displayImage, 1);
    try {
    } catch (Exception e) {
      System.out.println("Exception while loading.");
    if (displayImage.getWidth(this) == -1) {
      System.out.println("No jpg ");

  public void createBufferedImage() {
    bi = new BufferedImage(displayImage.getWidth(this), displayImage
        .getHeight(this), BufferedImage.TYPE_INT_RGB);

    big = bi.createGraphics();
    big.drawImage(displayImage, 0, 0, this);

  public void grayOut() {
    ColorConvertOp colorConvert = new ColorConvertOp(ColorSpace
        .getInstance(ColorSpace.CS_GRAY), null);
    colorConvert.filter(bi, bi);

  public void reset() {
    big.clearRect(0, 0, bi.getWidth(this), bi.getHeight(this));
    big.drawImage(displayImage, 0, 0, this);

  public void update(Graphics g) {
    g.clearRect(0, 0, getWidth(), getHeight());

  public void paintComponent(Graphics g) {
    Graphics2D g2D = (Graphics2D) g;

    g2D.drawImage(bi, 0, 0, this);


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