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Код

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.filechooser.FileFilter;
import java.io.*;
import java.awt.image.*;
import javax.imageio.*;
import java.net.*;

public class WorkWithImage extends JFrame
{
 MyChooser chooser = new MyChooser();

 WorkWithImage()
 {
  setBounds(100, 100, 400, 300);
  setJMenuBar(new MyMenu(this));
 }

 public static void main(String [] args)
 {
  JFrame f = new WorkWithImage();
  f.setVisible(true);
  f.setDefaultCloseOperation(3);
 }
}

class MyMenu extends JMenuBar
             implements ActionListener
{
 WorkWithImage f;

 MyMenu(WorkWithImage f)
 {
  this.f = f;
  JMenu file = new JMenu("File");
  JMenuItem open = new JMenuItem("Open file");
  JMenuItem exit = new JMenuItem("Exit");

  file.add(open);
  file.add(exit);
  add(file);

  open.addActionListener(this);
  exit.addActionListener(this);
 }

 public void actionPerformed(ActionEvent e)
 {
  if(e.getActionCommand().equals("Exit"))
    System.exit(0);

  else
  {
   MyChooser chooser = f.chooser;
   int x = chooser.showOpenDialog(null);

   if(x == JFileChooser.APPROVE_OPTION)
   {
    MyPanel panel = new MyPanel();
    panel.setImageFile(new File(chooser.getSelectedFile().getAbsolutePath()));
    f.add(panel);
    f.validate();
    f.repaint();
   }
  }
 }
}

class MyChooser extends JFileChooser
{
 MyChooser()
 {
  setFileFilter(new MyFilter());
 }

 class MyFilter extends FileFilter
 {
  public boolean accept(File file)
  {
   if(file.isDirectory())
     return true;
   return file.getName().endsWith("gif");
  }

  public String getDescription()
  {
   return ".gif";
  }
 }
}

class MyPanel extends JPanel 
              implements MouseMotionListener
{
 BufferedImage originalImage = null;
 Image image = null;
 static Point oldPoint = null;
 static Point newPoint = null;

 MyPanel() 
 {
  initComponents();
  addMouseMotionListener(this);
 }

 public void mouseMoved(MouseEvent e)
 {
  oldPoint = e.getPoint();
 }
 public void mouseDragged(MouseEvent e)
 {
  newPoint = e.getPoint();
  repaint();
 }
    
 private void initComponents() 
 {
  setLayout(null);

  addComponentListener(new ComponentAdapter() 
  {
   public void componentResized(ComponentEvent e)
   {
    formComponentResized(e);
   }
  });
 }
    
 private void formComponentResized(ComponentEvent e)
 {
  int w = getWidth();
  int h = getHeight();

  if ((originalImage != null) && (w > 0) && (h > 0)) 
  {
   image = originalImage.getScaledInstance(w, h, Image.SCALE_DEFAULT);
   repaint();
  }
 }

 public void paint(Graphics g) 
 {
  if (image != null) 
  {
   g.drawImage(image, 0, 0, null);
  }
       
  super.paintChildren(g);
  super.paintBorder(g);

  g.setColor(new Color(0, 0, 100, 50));

  if(oldPoint != null && newPoint != null)
  {
   g.fillRect(oldPoint.x, oldPoint.y,
              newPoint.x - oldPoint.x,
              newPoint.y - oldPoint.y);

   if(oldPoint.x > newPoint.x)
   {
    g.fillRect(newPoint.x, oldPoint.y,
               oldPoint.x - newPoint.x,
               newPoint.y - oldPoint.y);
   }
   if(oldPoint.y > newPoint.y)
   {
    g.fillRect(oldPoint.x, newPoint.y,
               newPoint.x - oldPoint.x,
               oldPoint.y - newPoint.y);
   }
   if(oldPoint.x > newPoint.x && oldPoint.y > newPoint.y)
   {
    g.fillRect(newPoint.x, newPoint.y,
               oldPoint.x - newPoint.x,
               oldPoint.y - newPoint.y);
   }
  }
 }
    
 public BufferedImage getImage() 
 {
  return originalImage;
 }
    
 public void setImage(BufferedImage image) 
 {
  this.originalImage = image;
  int w = this.getWidth();
  int h = this.getHeight();

  if ((originalImage != null) && w > 0 && h > 0)
  {
   this.image = originalImage.getScaledInstance(w, h, image.SCALE_DEFAULT);
  }
 }

 public void setImageFile(File file) 
 {
  try 
  {
   if (file == null) 
   {
    originalImage = null;
   }

   BufferedImage bi = ImageIO.read(file);
   originalImage = bi;
  } 
  catch (IOException ex){}
  repaint();
 }
}