title: Android image progress bar, change from black and white to colour
body: <p>I have an android app that uploads multiple files to a cloud platform.  As a progress bar i want to take an image that is black and white, originally colour.  As the upload progresses i'd like to return the image back to its colour.  Something similar to filling a jug with water, i.e. colour fills from the bottom to the top, if that makes sense.  </p>
  
  <p>I'm looking for someone to point me in the right direction.  I'm not sure where to start.</p>
  
  <p>Thank you!</p>