Generate 16-bit grayscale BitmapData and save to file

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This works for System.Drawing.Imaging.PixelFormat.Format16bppGrayScale:

    private static void SaveBmp(Bitmap bmp, string path)
    {
        Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);

        BitmapData bitmapData = bmp.LockBits(rect, ImageLockMode.ReadOnly, bmp.PixelFormat);

        var pixelFormats = ConvertBmpPixelFormat(bmp.PixelFormat);

        BitmapSource source = BitmapSource.Create(bmp.Width,
                                                  bmp.Height,
                                                  bmp.HorizontalResolution,
                                                  bmp.VerticalResolution,
                                                  pixelFormats,
                                                  null,
                                                  bitmapData.Scan0,
                                                  bitmapData.Stride * bmp.Height,
                                                  bitmapData.Stride);

        bmp.UnlockBits(bitmapData);


        FileStream stream = new FileStream(path, FileMode.Create);

        TiffBitmapEncoder encoder = new TiffBitmapEncoder();

        encoder.Compression = TiffCompressOption.Zip;
        encoder.Frames.Add(BitmapFrame.Create(source));
        encoder.Save(stream);

        stream.Close();
    }

    private static System.Windows.Media.PixelFormat ConvertBmpPixelFormat(System.Drawing.Imaging.PixelFormat pixelformat)
    {
        System.Windows.Media.PixelFormat pixelFormats = System.Windows.Media.PixelFormats.Default;

        switch (pixelformat)
        {
            case System.Drawing.Imaging.PixelFormat.Format32bppArgb:
                pixelFormats = PixelFormats.Bgr32;
                break;

            case System.Drawing.Imaging.PixelFormat.Format8bppIndexed:
                pixelFormats = PixelFormats.Gray8;
                break;

            case System.Drawing.Imaging.PixelFormat.Format16bppGrayScale:
                pixelFormats = PixelFormats.Gray16;
                break;
        }

        return pixelFormats;
    }

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