WFP

using (ColorImageFrame colorframe = e.OpenColorImageFrame())
            {


                if (colorframe == null)
                {
                    return;
                }

                byte[] pixels = new byte[colorframe.PixelDataLength];
                colorframe.CopyPixelDataTo(pixels);

                int stride = colorframe.Width * 4;//how many bytes we need (B G R empty)
                BitmapSource img = BitmapSource.Create(640, 480,
                    96, 96, PixelFormats.Bgr32, null, pixels, stride);

                var bitmapSource = colorframe.ToBitmapSource(); // using Coding4Fun.Kinect.Wpf extension
                Bitmap currentImage = KinectHelpers.GetBitmapFromBitmapSource(bitmapSource);

                Benchmark.Start();
                LockBitmap lockBitmap = new LockBitmap(currentImage);
                lockBitmap.LockBits();

                System.Drawing.Color compareClr = System.Drawing.Color.FromArgb(0, 0, 0, 255);
                for (int y = 0; y < lockBitmap.Height; y++)
                {
                    for (int x = 0; x < lockBitmap.Width; x++)
                    {
                        if (lockBitmap.GetPixel(x, y) == compareClr)
                        {
                            lockBitmap.SetPixel(x, y, System.Drawing.Color.Red);
                        }
                    }
                }
                lockBitmap.UnlockBits();
                Benchmark.End();
                double seconds = Benchmark.GetSeconds();
                Image1.Source = img;