mats that don't support or
 use alpha should return <a href="http://d.android.com/reference/android/graphics/Bitmap.Config.html?is-external=true#RGB_565" title="class or interface in android.graphics"><code>Bitmap.Config.RGB_565</code></a> for
 <a href="http://d.android.com/reference/android/graphics/Bitmap.html?is-external=true#getConfig--" title="class or interface in android.graphics"><code>Bitmap.getConfig()</code></a>.

 <p>On Android O+, this format will will use ARGB_8888 only when it's not possible 