Convert Colored Images to Black And white in java

Hi,

Sometime you want to convert colored images to black and white.

Here i am giving you the simple method to do so.

Just see below.

//example for coverting colored image to black and white

import java.awt.image.*;

import javax.imageio.ImageIO;

import java.io.*;

import java.awt.*;

class BlackAndWhite

{

          public static void main(String asr[])

          {

                   try

                   {

                             //colored image path

                             BufferedImage image = ImageIO.read(new  

                                                File("D:\\MyProgram\\output.jpg"));

                             //getting width and height of image

                             double image_width = image.getWidth();

                             double image_height = image.getHeight();

                             BufferedImage bimg = null;

                             BufferedImage img = image;

                             //drawing a new image      

                             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 = "blackAndwhite.jpeg";

                             File fi = new File("D:\\My Program\\" + temp);

                             ImageIO.write(bimg, "jpg", fi);

                   }

                   catch (Exception e)

                   {

                             System.out.println(e);

                   }

          }

}