import java.awt.*;
import java.awt.geom.*;
import java.awt.image.*;
 
public class Main {
 
   public static ImageIcon zoom(ImageIcon imI, double width, double height) {
      Image source = imI.getImage();
 
      BufferedImage dest = new BufferedImage(
            (int) (imI.getIconWidth() * width),
            (int) (imI.getIconHeight() * height),
            BufferedImage.TYPE_INT_RGB);
 
      AffineTransform ta = new AffineTransform();
 
      ta.scale(width, height);
 
      Graphics2D g2d = dest.createGraphics();
      g2d.drawImage(source, ta, null);
      g2d.dispose();
 
      return new ImageIcon(dest);
   }
 
   public static void main(String args[]) {
      JFrame f = new JFrame();
      JButton b = new JButton("test", new ImageIcon("button1.jpg"));
      b.setIcon(Main.zoom((ImageIcon) b.getIcon(), 0.5, 0.8));
      f.getContentPane().add(b);
      f.setSize(150, 150);
      f.setVisible(true);
   }
}