title: Tiff images aren't showing actual size in WPF Image control
body: <p>I've been working on a WPF application and need to be able to show multi-page tiffs at actual size as well as fit to screen.  The code I have from another StackOverflow thread is working great for showing some of them at their actual size, however the new scanned tiff files which are around 1700 x 800 are showing up to be about 600 x 400.  </p>
  
  <p>What I'm trying to achieve is basically a copy of how Windows Photo Viewer shows you images.  You can see them fit to the screen, or press a button and it zooms to actual size with scrollbars if needed.  I have 2 tiffs that work.  1 is JPEG saved as tiff from mspaint, the other (2) is an older scanned document.  1 is 180dpi, 32 bit depth, LZW compression and 2 resolution unit, it was taken with digital camera.  2 is 200 dpi, 1 bit depth, 2 resolution unit, CCITT t.6 compression, it was a scanned document.  The files that don't work are 300dpi but otherwise the same as #2.</p>
  
  <p>Here is the code i'm using to show the image.</p>
  
  <pre><code>// Open a Stream and decode a TIFF image
  Stream imageStreamSource = new FileStream("C:\\Users\\cblair\\Documents\\Visual Studio 2010\\Projects\\WpfApplication1\\WpfApplication1\\flowers.tif", FileMode.Open, FileAccess.Read, FileShare.Read);
  TiffBitmapDecoder decoder = new TiffBitmapDecoder(imageStreamSource, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
  BitmapSource bitmapSource = decoder.Frames[0];
   // Draw the Image
  myImage.Source = bitmapSource;
  </code></pre>
  
  <p>and the XML</p>
  
  <p><code>
      &lt;ScrollViewer HorizontalScrollBarVisibility="auto"&gt;
          &lt;Viewbox&gt;
              &lt;Image x:Name="myImage" /&gt;
          &lt;/Viewbox&gt;
      &lt;/ScrollViewer&gt;</code></p>