Image convert to Grayscale

package javaapplication6;

import java.awt.image.BufferedImage;
import java.awt.image.ColorConvertOp;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFileChooser;

/**
 *
 * @author tusharjoshi
 */
public class MainWindow extends javax.swing.JFrame {

    /**
     * Creates new form MainWindow
     */
    public MainWindow() {
        initComponents();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        imageLabel = new javax.swing.JLabel();
        chooseButton = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        chooseButton.setText("Choose");
        chooseButton.setActionCommand("Choose");
        chooseButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                chooseButtonActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(19, 19, 19)
                .addComponent(imageLabel)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(303, Short.MAX_VALUE)
                .addComponent(chooseButton)
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(imageLabel)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 259, Short.MAX_VALUE)
                .addComponent(chooseButton)
                .addContainerGap())
        );

        pack();
    }// </editor-fold>

    private void chooseButtonActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
        JFileChooser fileChooser = new JFileChooser();
        fileChooser.setDialogTitle("Open image?");
        fileChooser.showOpenDialog(this);
        try {
            //writes new file
            BufferedImage image = ImageIO.read(fileChooser.getSelectedFile());

            ImageIcon icon = new ImageIcon(image);
            imageLabel.setIcon(icon);

            BufferedImage image2 = new BufferedImage(image.getWidth(),
                    image.getHeight(), BufferedImage.TYPE_BYTE_GRAY);

            // convert colored image to grayscale
            ColorConvertOp grayScale = new ColorConvertOp(image.getColorModel().getColorSpace(),image2.getColorModel().getColorSpace(),null);
            grayScale.filter(image,image2);
            imageLabel.setIcon(new ImageIcon(image2));
        }
        catch (IOException f) {
            System.out.println("Saving failed! Could not save image.");
        }

    }

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new MainWindow().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify
    private javax.swing.JButton chooseButton;
    private javax.swing.JLabel imageLabel;
    // End of variables declaration
}