title: Imagick: unable to open file
body: <p>When simply calling the Imagick class:</p>
  
  <pre><code>$image = new Imagick('/images/magick/atmsk.png');
  </code></pre>
  
  <p>I get the error message:</p>
  
  <blockquote>
    <p>Fatal error: Uncaught exception 'ImagickException' with message
    'unable to open file `/images/magick/atmsk.png' @
    png.c/ReadPNGImage/2889' in .../imag.php:4 Stack trace: #0
    .../imag.php(4): Imagick->__construct('/images/magick/...') #1 {main}
    thrown in .../imag.php</p>
  </blockquote>
  
  <p>I have checked memory available as per another posting here and that is ok!</p>