public System.Drawing.Bitmap KnockOutGzf(String path)        {            System.Drawing.Image image = System.Drawing.Image.FromFile(path);            System.Drawing.Bitmap bitmapProxy = new System.Drawing.Bitmap(image);            image.Dispose();            for (int i = 0; i < bitmapProxy.Width; i++)            {                for (int j = 0; j < bitmapProxy.Height; j++)                {                    System.Drawing.Color c = bitmapProxy.GetPixel(i, j);                    if (!(c.R < 240 || c.G < 240 || c.B < 240))                    {                        bitmapProxy.SetPixel(i, j, System.Drawing.Color.Transparent);                    }                }            }            return bitmapProxy;        }