/**

  *

  */

 package com.b510.image.clent;

 import java.io.File;

 import com.b510.image.common.Common;

 import com.b510.image.util.ImageUtil;

 /**

  * @author Hongten

  * @create 2014-7-13

  * @mail hongtenzone@foxmail.com

  */

 public class Client {

     public static void main(String[] args) {

         File input = new File(Common.ORGINAL_IMAGE);

         File out = new File(Common.PROCESSED_IMAGE);

         ImageUtil.changeImge(input, out);

     }

 }

 /**

  *

  */

 package com.b510.image.common;

 /**

  * @author Hongten

  * @create 2014-7-13

  * @mail hongtenzone@foxmail.com

  */

 public class Common {

     // Orginal image path

     public static String ORGINAL_IMAGE = "src/com/b510/image/resources/orginal_image.jpg";

     // Processed image path

     public static String PROCESSED_IMAGE = "src/com/b510/image/resources/processed_image.jpg";

     public static String PROCESS_SUCCESS = "Processed successfully.....";

     public static String PROCESS_ERROR = "Processing encounters error!";

 }

 /**

  *

  */

 package com.b510.image.util;

 import java.awt.Image;

 import java.awt.color.ColorSpace;

 import java.awt.image.BufferedImage;

 import java.awt.image.ColorConvertOp;

 import java.io.File;

 import java.io.FileOutputStream;

 import java.io.IOException;

 import javax.imageio.ImageIO;

 import com.b510.image.common.Common;

 import com.sun.image.codec.jpeg.JPEGCodec;

 import com.sun.image.codec.jpeg.JPEGImageEncoder;

 /**

  * @author Hongten

  * @create 2014-7-13

  * @mail hongtenzone@foxmail.com

  */

 public class ImageUtil {

     /**

      * Color image is converted to black and white picture.

      */

     public static void changeImge(File input, File out) {

         try {

             Image image = ImageIO.read(input);

             int srcH = image.getHeight(null);

             int srcW = image.getWidth(null);

             BufferedImage bufferedImage = new BufferedImage(srcW, srcH, BufferedImage.TYPE_3BYTE_BGR);

             bufferedImage.getGraphics().drawImage(image, 0, 0, srcW, srcH, null);

             bufferedImage = new ColorConvertOp(ColorSpace.getInstance(ColorSpace.CS_GRAY), null).filter(bufferedImage, null);

             FileOutputStream fos = new FileOutputStream(out);

             JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(fos);

             encoder.encode(bufferedImage);

             fos.close();

             System.out.println(Common.PROCESS_SUCCESS);

         } catch (IOException e) {

             e.printStackTrace();

             throw new IllegalStateException(Common.PROCESS_ERROR, e);

         }

     }

 }