Error occurred on bitmap variable in .net

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C#

WinForms

Hi Sir,

I am developing a image processing project in which captured image is first converted into GrayScale after that processing on image with color according to dark spot.

First of all i am converting captured image into grayscale where I wrote following code and got an error.

private void cmb_cameras_SelectedIndexChanged(object sender, EventArgs e)
        {
            //selected video source
            FinalVideoSource = new VideoCaptureDevice(VideoCaptureDevices[cmb_cameras.SelectedIndex].MonikerString);
            FinalVideoSource.NewFrame += new NewFrameEventHandler(FinalVideoSource_NewFrame);
            FinalVideoSource.Start();
        }

        void FinalVideoSource_NewFrame(object sender, NewFrameEventArgs eventArgs)
        {
            try
            {
                LiveImage = (Bitmap)eventArgs.Frame.Clone();
                Bitmap newBitmap = new Bitmap(LiveImage.Width, LiveImage.Height);

                //create a blank bitmap the same size as original
                //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(LiveImage, new Rectangle(0, 0, LiveImage.Width, LiveImage.Height),
                   0, 0, LiveImage.Width, LiveImage.Height, GraphicsUnit.Pixel, attributes);
                PB_LiveImage.Image = newBitmap;
                g.Dispose();
                attributes.Dispose();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
            
        }

I am using Aforge to captured image.

The error I face:

System.ArgumentException: Parameter is not valid.
at System.Drawing.Bitmap..ctor(Int32 width, Int32 height, PixelFormat format)
at System.Drawing.Bitmap..ctor(Int32 width, Int32 height)
at FootPrintMapping.MainScreen.FinalVideoSource_NewFrame(Object sender, NewFrameEventArgs eventArgs) in MainScreen.cs:line 59