Image Processing Java

Using This Code I Compressed A JPEG Image And the Original Size of the image is 257kb and The Compressed Image Size Is 27kb How Can I Decompress It Please Give Me The "SOURCE CODE" And Hee is my Source Code.... Please kindly Help Me?

import java.awt.image.BufferedImage;

import java.awt.image.RenderedImage; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.IOException; import java.util.Iterator;

import javax.imageio.IIOImage; import javax.imageio.ImageIO; import javax.imageio.ImageWriteParam; import javax.imageio.ImageWriter; import javax.imageio.stream.FileImageOutputStream; import javax.imageio.stream.ImageOutputStream; import javax.swing.JFrame;

import com.sun.media.jai.widget.DisplayJAI;

/* * Shows how to save an image in JPEG with different compression factors. * Based on code from http://forums.java.net/jive/thread.jspa?messageID=243429 * and from http://www.universalwebservices.net/web-programming-resources/java/adjust-jpeg-image-compression-quality-when-saving-images-in-java */ public class DemoJPEGCompression { /* * Application starting point, open an image and save it in JPEG with a * compression factor. */ public static void main(String[] args) throws IOException { // Load the image (it is hard-coded here to make the code simpler). String imageFile = "/tmp/folhas.png"; BufferedImage i = ImageIO.read(new File(imageFile)); showImage("Original Image", i); // Show results with different compression ratio. compressAndShow(i, 0.5f); }

 public static void compressAndShow(BufferedImage image, float quality) throws IOException
   {
   // Get a ImageWriter for jpeg format.
   Iterator<ImageWriter> writers = ImageIO.getImageWritersBySuffix("jpeg");
   if (!writers.hasNext()) throw new IllegalStateException("No writers found");
   ImageWriter writer = (ImageWriter) writers.next();
   // Create the ImageWriteParam to compress the image.
   ImageWriteParam param = writer.getDefaultWriteParam();
   param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
  param.setCompressionQuality(quality);
   // The output will be a ByteArrayOutputStream (in memory)
   ByteArrayOutputStream bos = new ByteArrayOutputStream(32768);
   ImageOutputStream ios = ImageIO.createImageOutputStream(bos);
   writer.setOutput(ios);
   writer.write(null, new IIOImage(image, null, null), param);
   ios.flush(); // otherwise the buffer size will be zero!
   // From the ByteArrayOutputStream create a RenderedImage.
   ByteArrayInputStream in = new ByteArrayInputStream(bos.toByteArray());
  RenderedImage out = ImageIO.read(in);
   int size = bos.toByteArray().length;
   showImage("Compressed to " + quality + ": " + size + " bytes", out);
 // Uncomment code below to save the compressed files.

// File file = new File("compressed."+quality+".jpeg"); // FileImageOutputStream output = new FileImageOutputStream(file); // writer.setOutput(output); writer.write(null, new IIOImage(image, null,null), param); }

/*
 * This method just create a JFrame to display the image. Closing the window
 * will close the whole application.
 */
 private static void showImage(String title,RenderedImage image)
   {
   JFrame f = new JFrame(title);
   f.getContentPane().add(new DisplayJAI(image));
  f.pack();
   f.setVisible(true);
   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  }

 }