Correcting error of write Image to file

Correcting error of write Image to file

Hi All,
I want to correct an error of ImageIO.write(...

1 error found:
File: C:\Documents and
Settings\bH\Desktop\OpaqueToTransparent.java [line: 39]
Error: C:\Documents and Settings\bH\Desktop\OpaqueToTransparent.
java:39: cannot find symbol
symbol : method write(java.awt.Image,java.lang.String,java.
io.File)
location: class javax.imageio.ImageIO

TIA
bH

//from http://www.rgagnon.com/javadetails/java-0265.html
//from http://www.exampledepot.com/egs/javax.imageio/

import java.awt.Image;
import java.awt.Color;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import java.io.IOException;
import java.io.File;
import javax.imageio.ImageIO;

public class OpaqueToTransparent extends JFrame {
  Image GifOrigWithBlueBackgrnd;
  Image GifModifWithTransparentBackgrnd;

  OpaqueToTransparent() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    init();
    setVisible(true);
  }

  public void init() {
    try {
      // Read from a file
      File file = new File("images/cosmob.gif");
      GifOrigWithBlueBackgrnd = ImageIO.read(file);
      GifModifWithTransparentBackgrnd =
        Transparency.makeColorTransparent
        (GifOrigWithBlueBackgrnd, new Color(0).blue);

    } catch (IOException e) {}
    //try {
    File file = new File("images/cosmobX.gif");
      //error on the next line
      ImageIO.write(GifModifWithTransparentBackgrnd,
      "gif", file);
   }
    catch (IOException e) {}

    // Use a label to display the image
    JFrame frame = new JFrame();
    JLabel label1 = new JLabel(new
    ImageIcon(GifOrigWithBlueBackgrnd));
    JLabel label2 = new JLabel(new
    ImageIcon(GifModifWithTransparentBackgrnd));
    frame.getContentPane().add(label1, BorderLayout.CENTER);
    frame.getContentPane().add(label2, BorderLayout.SOUTH);
    frame.pack();
    frame.setVisible(true);
  }

  public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
      @Override
      public void run() {
        new OpaqueToTransparent();
      }
    });
  }
}

import java.awt.*;
import java.awt.image.*;

public class Transparency {
  public static Image makeColorTransparent
    (Image im, final Color color) {
    ImageFilter filter = new RGBImageFilter() {
      // the color we are looking for...
      // Alpha bits are set to opaque
      public int markerRGB = color.getRGB() | 0xFF000000;

      public final int filterRGB(int x, int y, int rgb) {
        if ( ( rgb | 0xFF000000 ) == markerRGB ) {
          // Mark the alpha bits as zero - transparent
          return 0x00FFFFFF & rgb;
        }
        else {
          // nothing to do
          return rgb;
        }
      }
    };

    ImageProducer ip = new FilteredImageSource(im.getSource(),
                                               filter);
    return Toolkit.getDefaultToolkit().createImage(ip);
  }
}