title: Detect picture format with SixLabors ImageSharp
body: <p>How do I get the image format using SixLabors.ImageSharp?</p>
  
  <p>In version <strong>1.0.0-alpha9-00152</strong> I could use:</p>
  
  <pre><code>Image&lt;Rgba32&gt; image = Image.Load(GetBytesFromBlobStorage());
  IImageFormat format = image.CurrentImageFormat;
  </code></pre>
  
  <p>but <code>.CurrentImageFormat()</code> doesn't seen to be able in beta version <strong>1.0.0-beta0001</strong>.</p>
  
  <p>I want to know if the image is <strong>.png</strong>, <strong>.bmp</strong> or <strong>.jpeg</strong>.</p>