title: Change button image in Unity 3D
body: <p>I'm a Unity nob, so please don't flame me for this question.</p>
  
  <p>I'm trying to change a simple UI button to look like a Play button (via simple Play PNG image), I see that the Button have a <code>Source Image</code> under the Image script, but as far as I can see I must select a Sprite.</p>
  
  <p>How can I create a Sprite from a PNG Image?</p>