how to Image Blur

blur.cs

//Resmi blur yapma
private Bitmap Blur(Image img)
{
    Bitmap pic = new Bitmap(img);
    for (int w = 0; w < pic.Width; w++)
    {
        for (int h = 0; h < pic.Height; h++)
        {
            Color c = pic.GetPixel(w, h);
            Color newC = Color.FromArgb(80, c);
            //if (c.ToArgb() != 0)
            pic.SetPixel(w, h, newC);
        }
    }
    return pic;
}

obje.Image = Blur(obje.Image);