title: Using pythons open function for .png Image
body: <p>Im getting an error when using pythons inbuild function "open" and don't know how to get it to work for png files. </p>
  
  <p><strong>Examplecode</strong>: <code>img =open('here.png').read()</code></p>
  
  <p><strong>Error</strong>: <code>UnicodeDecodeError: 'charmap' codec can't decode byte 0x90 in position 101: character maps to &lt;undefined&gt;</code></p>