K thanks for ur suggestion :)

I tired this code for converting RGB image to Ycbcr but it doesnt work this code also contain to covert RGB to Grayscale import java.awt.*; import java.awt.event.*; import java.util.*; import java.io.*; import javax.swing.*; import java.awt.image.*; import javax.imageio.ImageIO; public class Picture{ JFileChooser fileChooser = new JFileChooser(); final JFrame frame = new JFrame("Edit Image"); Container content; static BufferedImage image; BufferedImage image2; JLabel imageLabel; public Picture() { //asks for image file as input fileChooser.setDialogTitle("Choose an image file to begin:"); fileChooser.showOpenDialog(frame); File selectedFile = fileChooser.getSelectedFile(); if (fileChooser.getSelectedFile() != null) { try { //reads File as image image = ImageIO.read(selectedFile); } catch (IOException e) { System.out.println("Invalid image file: " + selectedFile); System.exit(0); } } else { System.out.println("No File Selected!"); } } public int width() { //returns width of present image int width = image.getWidth(); return width; } public int height() { //returns height of present image int height = image.getHeight(); return height; } /* public void getImage() { this.image = image2; } */ public void saveImage() { //saves current image as JPEG fileChooser.setDialogTitle("Save this image?"); fileChooser.showSaveDialog(frame); try { //writes new file ImageIO.write(this.image, "JPG", fileChooser.getSelectedFile()); } catch (IOException f) { System.out.println("Saving failed! Could not save image."); } } public void show() { //set frame title, set it visible, etc content = frame.getContentPane(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setResizable(false); //add the image to the frame ImageIcon icon = new ImageIcon(image); imageLabel = new JLabel(icon); frame.setContentPane(imageLabel); //add a menubar on the frame with a single option: saving the image JMenuBar menuBar = new JMenuBar(); frame.setJMenuBar(menuBar); JMenu

K fine..i tried to convert an image from RGB to Ycrbr but it does work...Can u tell where i made the mistake... import java.awt.*; import java.awt.event.*; import java.util.*; import java.io.*; import javax.swing.*; import java.awt.image.*; import javax.imageio.ImageIO; public class Picture{ JFileChooser fileChooser = new JFileChooser(); final JFrame frame = new JFrame("Edit Image"); Container content; static BufferedImage image; BufferedImage image2; JLabel imageLabel; public Picture() { //asks for image file as input fileChooser.setDialogTitle("Choose an image file to begin:"); fileChooser.showOpenDialog(frame); File selectedFile = fileChooser.getSelectedFile(); if (fileChooser.getSelectedFile() != null) { try { //reads File as image image = ImageIO.read(selectedFile); } catch (IOException e) { System.out.println("Invalid image file: " + selectedFile); System.exit(0); } } else { System.out.println("No File Selected!"); } } public int width() { //returns width of present image int width = image.getWidth(); return width; } public int height() { //returns height of present image int height = image.getHeight(); return height; } /* public void getImage() { this.image = image2; } */ public void saveImage() { //saves current image as JPEG fileChooser.setDialogTitle("Save this image?"); fileChooser.showSaveDialog(frame); try { //writes new file ImageIO.write(this.image, "JPG", fileChooser.getSelectedFile()); } catch (IOException f) { System.out.println("Saving failed! Could not save image."); } } public void show() { //set frame title, set it visible, etc content = frame.getContentPane(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setResizable(false); //add the image to the frame ImageIcon icon = new ImageIcon(image); imageLabel = new JLabel(icon); frame.setContentPane(imageLabel); //add a menubar on the frame with a single option: saving the image JMenuBar menuBar = new JMenuBar(); frame.setJMenuBar(menuBar); JMenu progName

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