Image Brightness

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; double sum = 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); sum+= lum; count += 1; }} double averageLum = sum/count; System.out.println("The average luminance is " + averageLum); } }catch(Exception e){ System.out.println("ERROR " + e); } } } import javax.swing.*; import java.awt.event.*; import java.awt.*; import java.util.*; import javax.swing.filechooser.*; import java.io.*; public class ChooseFile extends JPanel implements ActionListener { JButton go; String sourceFolder=""; String theFile=""; JFileChooser chooser; String choosertitle; public ChooseFile() { go = new JButton("Choose Folder"); go.addActionListener(this); add(go); } public void actionPerformed(ActionEvent e) { System.out.println("Button Clicked"); chooser = new JFileChooser(); chooser.setCurrentDirectory(new java.io.File(".")); chooser.setDialogTitle(choosertitle); FileNameExtensionFilter filter = new FileNameExtensionFilter( "JPG, PNG & GIF Images", "jpg", "gif", "png"); chooser.setFileFilter(filter); chooser.setFileSelectionMode(JFileChooser.FILES_ONLY); if (chooser.showOpenDialog(this) == JFileChooser.APPROVE_OPTION) { String dirr = "" + chooser.getCurrentDirectory(); File file = chooser.getSelectedFile(); if(dirr.substring(dirr.length()-1,dirr.length()).equals(".")){ dirr = dirr.substring(0,dirr.length()-1); sourceFolder=""+dirr + "" + file.getName(); }else{ sourceFolder=""+dirr + "/" + file.getName(); } System.out.println("Folder path: " + dirr + " | File Name: " + file.getName()); System.out.println(sourceFolder); ExamineImage.lum(sourceFolder); }else { System.out.println("No Selection "); } } public Dimension getPreferredSize(){ return new Dimension(200, 200); } public static void main(String s[]) { JFrame frame = new JFrame(""); ChooseFile panel = new ChooseFile(); frame.addWindowListener( new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } } ); frame.getContentPane().add(panel,"Center"); frame.setSize(panel.getPreferredSize()); frame.setVisible(true); } }