title: PNG format images do not display on Mac Safari
body: <p>Images from our website do not display in Safari for some Mac users and they report seeing either no image or a black image. Here is an example:</p>
  
  <p><a href="http://s3-eu-west-2.amazonaws.com/bp18.boxcleverpress.com/Boxclever_logo_chartreuse.png" rel="nofollow noreferrer">http://s3-eu-west-2.amazonaws.com/bp18.boxcleverpress.com/Boxclever_logo_chartreuse.png</a></p>
  
  <p>What I have discovered is:</p>
  
  <ul>
  <li>Images display on PC</li>
  <li>Images display on SOME Macs (I have an older one that is OK)</li>
  <li>Images display on iPhones and iPads</li>
  <li>Images are PNG</li>
  <li>I have optimised the images with pngtastic</li>
  <li>When images are copied to the Mac and opened with Adobe Photoshop they give the error: the file format module cannot parse the file</li>
  <li>When I tried to open a pngtastic optimised file in Photoshop Elements on Windows I also get that error</li>
  <li>When I tried to open the optimised file in Photoshop on Windows I get the error IDAT: incorrect data check</li>
  </ul>
  
  <p>I will replace the optimised images with unoptimised ones but I am not sure if this problem is with pngtastic or Adobe image libraries or something else. </p>