Convert a Color Image to Grayscale.

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convert

image

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 Rectangle(0, 0, original.Width, original.Height),
       0, 0, original.Width, original.Height, GraphicsUnit.Pixel, attributes);
 
   //dispose the Graphics object
    g.Dispose();
    return newBitmap;
 }

Get: Bitmap original
Returns: newBitmap

I did not know how to send a picture and how to get and save the new image to a new file.