Creating and Printing Bitmaps from Visuals

Question

I am trying to find an reusable and elegant way to create bitmaps from a visuals in WPF and then print the bitmap to a TLP-2844 zebra printer. The bitmap image needs to be 203 DPI since this is what the Zebra printer supports. I have tried everything I can think and I have to be missing something either completely obvious or what I am trying to do is not as simple as I am making it.

When I print the bitmap that gets created to a normal printer it looks perfectly fine but when printed to the zebra printer the image is scaled down to a 1/3 of its original size.

When I step through the code and look at the final bitmap generated it is the correct DPI and the correct height and width.

Below I have provided the code I am using to create my bitmap.

  public void PrintMyVisual()
    {
        BitmapSource bmpSource = Utilities.ImageHelper.GetBitmapSource(this.label); //label is grid with some controls
        this.BmpImg = Utilities.ImageHelper.CreateBMPFromBitmapSource(bmpSource);

        PrintDocument pdoc = new PrintDocument();
        pdoc.PrintPage +=new PrintPageEventHandler(pdoc_PrintPage);
    }

    void pdoc_PrintPage(object sender, PrintPageEventArgs e)
    {
        Graphics g = e.Graphics;

        g.DrawImage(this.BmpImg, 0, 0);
    }

    public static Bitmap CreateBMPFromBitmapSource(BitmapSource bmpSource)
    {
        Bitmap newBitmap = null;
        PngBitmapEncoder encoder = new PngBitmapEncoder();
        encoder.Frames.Add(BitmapFrame.Create(bmpSource));

        using (MemoryStream imageStream = new MemoryStream())
        {
            encoder.Save(imageStream);
            newBitmap = new Bitmap(imageStream);
        }
        return newBitmap;
    }

    public static BitmapSource GetBitmapSource(Visual vis)
    {
        DependencyObject dpObj = vis;

        FrameworkElement fe = dpObj as FrameworkElement;

        BitmapScalingMode xx = RenderOptions.GetBitmapScalingMode(dpObj);
        RenderOptions.SetBitmapScalingMode(dpObj, BitmapScalingMode.HighQuality);

        //96dpi is what wpf renders at but I am going to try 203
        RenderTargetBitmap btmp = new RenderTargetBitmap(Convert.ToInt32(Math.Ceiling(fe.ActualWidth)),
            Convert.ToInt32(Math.Ceiling(fe.ActualHeight)), 203, 203, PixelFormats.Pbgra32);

        btmp.Render(fe);

        return btmp;
    }