title: Unable to read white on black Data Matrix barcode
body: <p>Data Matrix barcode support was added to iOS 8 and I'm able to use it to read Data Matrix barcodes if they are black on white (dark on light). However, it never reads a white on black (light on dark) barcode.</p>
  
  <p>Reads this fine:</p>
  
  <p><img src="https://i.stack.imgur.com/WCOFz.png" alt="enter image description here"></p>
  
  <p>Unable to read this:</p>
  
  <p><img src="https://i.stack.imgur.com/Q44wv.png" alt="enter image description here"></p>
  
  <p>Per Data Matrix ECC 200, light on dark should be supported.</p>
  
  <p>Anyone have an idea how to get iOS 8 to read a light on dark Data Matrix barcode?</p>