title: why imagemagick and gd get picture Pixels are different？
body: <p>I hava picture?The picture format is gif.</p>
  
  <pre><code>&lt;?php
      $animation = new Imagick('1.gif');
      echo $animation-&gt;getImageWidth();
      echo "\n";
      echo $animation-&gt;getImageHeight();
  ?&gt;
  </code></pre>
  
  <p>return <code>70 124</code>;</p>
  
  <pre><code>&lt;?php
      $a = getimagesize('1.gif');
      echo ($a[3]);
  ?&gt;
  </code></pre>
  
  <p>return <code>width="160" height="217"</code>;
  I try other gif picture,the result is same.</p>