Implement a Program for Feature Extraction in 2D Colour Images (any features like Colour, Texture etc.)

 package com.prac.prac;  
 import java.awt.*;  
 import java.awt.image.BufferedImage;  
 import java.io.*;  
 import java.util.*;  
 import javax.imageio.ImageIO;  
 public class Exatraction {  
      private static BufferedImage orignal,answer;   
      public static void main(String[] args) throws IOException{  
           File orignal_f=new File("a.jpg");  
           orignal = ImageIO.read(orignal_f);  
            answer=imageHistogram(orignal);  
           writeImage("featureExtraction");  
      }  
      private static void writeImage(String output) throws IOException {  
     File file = new File(output+".jpg");  
     ImageIO.write(answer, "jpg", file);  
   }  
       private static int colorToRGB(int alpha, int red, int green, int blue) {  
          int newPixel = 0;  
          newPixel += alpha; newPixel = newPixel << 8;  
          newPixel += red; newPixel = newPixel << 8;  
          newPixel += green; newPixel = newPixel << 8;  
          newPixel += blue;  
          return newPixel;  
        }  
       public static BufferedImage imageHistogram(BufferedImage input) {  
                 BufferedImage redGraph = new BufferedImage(input.getWidth(),input.getHeight(),input.getType());  
          for(int i=0; i<input.getWidth(); i++)   
          {  
            for(int j=0; j<input.getHeight(); j++)   
            {  
                 int alpha =new Color(input.getRGB (i, j)).getAlpha();  
              int red = new Color(input.getRGB (i, j)).getRed();  
              int green = new Color(input.getRGB (i, j)).getGreen();  
              int blue = new Color(input.getRGB (i, j)).getBlue();  
              redGraph.setRGB(i, j, colorToRGB(alpha, 0,0,blue));  
            }  
          }  
          return redGraph;  
        }  
 }  

Input to the Program :

Output from the Program :