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Image Thinning using JAVA

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Hi!
I have written some code in java to convert a colored image into black and white image and then tried to perform thinning on that gray-scale image. Black and white conversion is done successfully, but image thinning is still not giving correct output. Kindly help me in fixing my problem. My code is as follows:

//colored image to black and white conversion; black and white image to thinned image.

public static void main(String[] args) 
{
    try
    {
        //colored image path
        BufferedImage colored_image = ImageIO.read(new File("D:\\logo.jpg"));
        //getting width and height of image
        double image_width = colored_image.getWidth();
        double image_height = colored_image.getHeight();
        BufferedImage img = colored_image;
 
        //drawing a new image
        BufferedImage bimg = new BufferedImage((int)image_width, (int)image_height, BufferedImage.TYPE_BYTE_GRAY);
        Graphics2D gg = bimg.createGraphics();
        gg.drawImage(img, 0, 0, img.getWidth(null), img.getHeight(null), null);
 
        //saving black and white image onto drive
        String temp = "logo in blackAndwhite.jpeg";
        File fi = new File("D:\\" + temp);
        ImageIO.write(bimg, "jpg", fi);
 
        //thinning by resizing gray scale image to desired eight and width
        BufferedImage bimg2 = new BufferedImage((int)image_width, (int)image_height, BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2 = bimg2.createGraphics();
 
        // Perform your drawing here
        g2.setColor(Color.BLACK);
        g2.drawLine(0, 0, 200, 200);
 
       //saving thinned image onto drive
       String temp2 = "logo thinned.jpeg";
       File fi2 = new File("D:\\" + temp2);
       ImageIO.write(bimg2, "jpg", fi2);
       //g2.dispose();
    }
    catch (Exception e)
    {
        System.out.println(e);
    }       
 }

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Image Thinning using JAVA sumera <kanwal.sumera@yahoo.com> - 2012-06-26 11:50 -0500
  Re: Image Thinning using JAVA markspace <-@.> - 2012-06-26 10:21 -0700
  Re: Image Thinning using JAVA "John B. Matthews" <nospam@nospam.invalid> - 2012-06-26 14:39 -0400
  Re: Image Thinning using JAVA Knute Johnson <nospam@knutejohnson.com> - 2012-06-26 14:26 -0700
    Re: Image Thinning using JAVA "John B. Matthews" <nospam@nospam.invalid> - 2012-06-26 23:15 -0400
      Re: Image Thinning using JAVA Knute Johnson <nospam@knutejohnson.com> - 2012-06-26 22:04 -0700
        Re: Image Thinning using JAVA "John B. Matthews" <nospam@nospam.invalid> - 2012-06-27 21:35 -0400
  Re: Image Thinning using JAVA Roedy Green <see_website@mindprod.com.invalid> - 2012-06-27 07:01 -0700

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