title: convert 32bpp Bitmap to 16bpp (Grayscale)
body: <p>I'm creating a Bitmap in C# from an Image object.</p>
  
  <p>The Bitmap I get is 32bpp, how can I transform that to 16bpp?</p>
  
  <pre><code>Bitmap image_bmp;
  System.Drawing.Image tmp = (System.Drawing.Image)img.RenderImage(0); //RenderImage creates an object of tyoe System.Drawing.Image
  image_bmp = new Bitmap(tmp);
  </code></pre>