C#: Image conversion to Sepia & Black/White conversion is not working.

Hi Guys,

I'm working on conversion of colors to Sepia & Black/White. I don't see any error but the output is nothing. The conversion is not happen from original image to Sepia or Black/White .

Somebody please tell me what is the mistake here. Thank you.

Gray-scale or B/W:

 private void Button_Click_1(object sender, RoutedEventArgs e) //GrayScale/Black&White
        {
             string destination_dir = @"C:\Users\krangaraj\Pictures\AAA";

             string[] extensions = { ".jpg", ".gif", ".jpeg", ".png", ".tiff" };

            string[] dizin = Directory.GetFiles(destination_dir, "*.*")
                .Where(f => extensions.Contains(new FileInfo(f).Extension.ToLower())).ToArray();


            foreach (string file_name in dizin)
            {
                Image img = Image.FromFile(file_name);
                Bitmap bmp = img as Bitmap;

                BitmapData bmpData = bmp.LockBits(new System.Drawing.Rectangle(0, 0, img.Width, img.Height),
                                                  ImageLockMode.ReadWrite, bmp.PixelFormat);

                int byteCount = bmpData.Stride*bmpData.Height;
                byte[] bytes = new byte[byteCount];

                Marshal.Copy(bmpData.Scan0, bytes, 0, byteCount);
                bmp.UnlockBits(bmpData);

                Bitmap bmpNew = new Bitmap(bmp.Width, bmp.Height);
                BitmapData bmpData1 = bmpNew.LockBits(new System.Drawing.Rectangle(new Point(), bmpNew.Size),
                                                      ImageLockMode.ReadWrite, bmp.PixelFormat);
                Marshal.Copy(bytes, 0, bmpData1.Scan0, bytes.Length);
                bmpNew.UnlockBits(bmpData1);
                bmp.Dispose();

                MakeGrayscale3(bmpNew);
                bmpNew.Save(file_name);
            }
        }

        public static Bitmap MakeGrayscale3(Bitmap original)
        {
                    //create a blank bitmap the same size as original
                    Bitmap newBitmap = new Bitmap(original.Width, original.Height);

                    //get a graphics object from the new image
                    Graphics g = Graphics.FromImage(newBitmap);

                    //create the grayscale ColorMatrix
                    ColorMatrix colorMatrix = new ColorMatrix(
                       new float[][] 
              {
                 new float[] {.3f, .3f, .3f, 0, 0},
                 new float[] {.59f, .59f, .59f, 0, 0},
                 new float[] {.11f, .11f, .11f, 0, 0},
                 new float[] {0, 0, 0, 1, 0},
                 new float[] {0, 0, 0, 0, 1}
              });

                    //create some image attributes
                    ImageAttributes attributes = new ImageAttributes();

                    //set the color matrix attribute
                    attributes.SetColorMatrix(colorMatrix);

                    //draw the original image on the new image
                    //using the grayscale color matrix
                    g.DrawImage(original, new System.Drawing.Rectangle(0, 0, original.Width, original.Height),
                       0, 0, original.Width, original.Height, GraphicsUnit.Pixel, attributes);

                    //dispose the Graphics object
                    g.Dispose();
                    return newBitmap;
        }
		

Sepia:

private void Button_Click(object sender, RoutedEventArgs e) //Sepia
        {
            string destination_dir = @"C:\Users\krangaraj\Pictures\AAA";

            string[] extensions = { ".jpg", ".gif", ".jpeg", ".png", ".tiff" };

            string[] dizin = Directory.GetFiles(destination_dir, "*.*")
                .Where(f => extensions.Contains(new FileInfo(f).Extension.ToLower())).ToArray();

            
            foreach (string file_name in dizin)
            {
                
                Image img = Image.FromFile(file_name);
                Bitmap bmp = img as Bitmap;

                BitmapData bmpData = bmp.LockBits(new System.Drawing.Rectangle(0, 0, img.Width, img.Height), ImageLockMode.ReadWrite, bmp.PixelFormat);

                int byteCount = bmpData.Stride * bmpData.Height;
                byte[] bytes = new byte[byteCount];

                Marshal.Copy(bmpData.Scan0, bytes, 0, byteCount);
                bmp.UnlockBits(bmpData);

                Bitmap bmpNew = new Bitmap(bmp.Width, bmp.Height);
                BitmapData bmpData1 = bmpNew.LockBits(new System.Drawing.Rectangle(new Point(), bmpNew.Size), ImageLockMode.ReadWrite, bmp.PixelFormat);
                Marshal.Copy(bytes, 0, bmpData1.Scan0, bytes.Length);
                bmpNew.UnlockBits(bmpData1);
                bmp.Dispose();

                DrawAsSepiaTone(bmpNew);
                bmpNew.Save(file_name);
                
            }
            
        }