title: Removing the Alpha channel from an image in Preview 9
body: <p>Preview has had the capability to remove the alpha channel from an image.  See <a href="https://stackoverflow.com/questions/26171739/remove-alpha-channel-in-an-image">Remove alpha channel in an image</a></p>
  
  <p>Preview 9 (OS 10.12.4) does not appear to have the alpha channel toggle box.  Can someone recommend a method for deleting the alpha channel from an image in Preview 9?</p>