imagebrightness.java

import java.io.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.AffineTransform;
import java.awt.image.*;
import javax.imageio.*;
import javax.swing.*;
import java.awt.AlphaComposite;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
 import javax.swing.ImageIcon;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.event.*;
import java.util.*;

public class ExamineImage{

public static void lum(String ffile) {
    BufferedImage img=null;
   
    File myFile = new File(ffile);
      //  File[] listOfFiles = myFolder.listFiles();
   
try{

              if (myFile.isFile()) {
              
            
               
                img = ImageIO.read(myFile);
                int width=0;
                int height=0;

                int count=0;
                double avg=0;
                            if(img!=null){
                               width  = img.getWidth();
                               height  = img.getHeight();
                            }
                             System.out.println("Width " + width + " " +  height);
                             
                
                for(int x=0; x < width; x++){
                    for (int y=0;y < height;y++){
                                   
                                 
                                     int pixelCol = img.getRGB(x, y);
                                        int a = (pixelCol >>> 24) & 0xff;
                                        int r = (pixelCol >>> 16) & 0xff;
                                        int g = (pixelCol >>> 8) & 0xff;
                                        int b = pixelCol & 0xff;
                                    
                                       
                                     double lum=   (0.2126*r) + (0.7152*g) + (0.0722*b);
                                  
                                     
                           }}  
                           
                    
                            System.out.println("The average luminance is ");
                 
               
            }

}catch(Exception e){

System.out.println("THERE WAS A PROBLEM " + e);
}

}//end of lumanance method











}//end of class