title: Clean tainted canvas
body: <p>Is it possible to clean a tainted canvas?</p>
  
  <p>I have an Openlayers map where user can add layer with CORS restriction. I can't bypass the cors by my proxy config and crossOrigin='anonymus' is not an option.</p>
  
  <p>What I need, it's to be able to remove the "<em>bad</em>" layer and let the user produces the map image.</p>
  
  <p>So I try to:</p>
  
  <ul>
  <li>Remove the layer who can't be printed </li>
  <li>Try to sync the map </li>
  <li>Try to print </li>
  </ul>
  
  <p>But I always get the cors error. How can I make my map <em>great again</em> without refreshing the browser?</p>