title: Android apply colorMatrix colorFilter on part of imageView with a mask
body: <p>I want to change the brightness on certain part of an image. I know how to use ColorMatrix to change the brightness(or hue) of an image. But it will be applied to the whole image. </p>
  
  <p>I have a mask file (black and white image). I want to apply the brightness change <strong>only</strong> on the the white part of that mask.How to do this in Android?</p>
  
  <p>Below is a mask image and the result I want to get.</p>
  
  <p><img src="https://i.stack.imgur.com/yGHPk.png" alt="enter image description here">
  <img src="https://i.stack.imgur.com/bgbxB.jpg" alt="enter image description here"></p>