title: Prevent browser anti-aliasing when upscaling?
body: <p>With Google's Chart Image API (which was unfortunately deprecated April 2012), you can generate QR codes.</p>
  
  <p><img src="https://i.stack.imgur.com/1f3ym.png" alt="QR code"></p>
  
  <p>I'm sure I can change the size of the resulting image using the API, but I'd rather just use CSS and the width and height properties to make it a little bigger.<br>
  In Chrome at least, this results in nasty anti-aliasing (not preferable, since it needs to be parsable by machines). Is there a way to tell browsers not to anti-alias upscaled images?</p>