I'm getting a byte array from a library and I want to save it as a Tiff file grayscale / 16-bit per pixel.

I'm using this method to do so:

```
private static void CreateBitmapFromBytes(byte[] pixelValues)
{
  Bitmap pic = new Bitmap(1024, 1024, PixelFormat.Format16bppGrayScale);

  BitmapData picData = pic.LockBits
   ( new Rectangle(0, 0, pic.Width, pic.Height)
   , ImageLockMode.ReadWrite
   , pic.PixelFormat
   );
  IntPtr pixelStartAddress = picData.Scan0;

  Marshal.Copy(pixelValues, 0, pixelStartAddress, pixelValues.Length);

  pic.UnlockBits(picData);
  pic.Save("grid.tif", ImageFormat.Tiff); //< HERE IS THE ERROR
}

```

And I get the error "A generic error occurred in GDI+".
The problem occurs both on Vista/32-bit and Win7/64-bit.
I'm using .NET 4.0

**EDIT:**

If I change `ImageFormat.Tiff` to `ImageFormat.Bmp` I don't have the error. But it's still a TIFF image that I want.