title: COMPOSITE_DISSOLVE is not working in PHP
body: <p>I want to make the mixed image with fade effect from two images.</p>
  
  <p>Here is my PHP code.</p>
  
  <pre><code>$img1 = new Imagick();
  $img1-&gt;readImage("images/1.jpg");
  
  $img2 = new Imagick();
  $img2-&gt;setOption('compose:args', '50');
  $img2-&gt;readImage("images/2.jpg");
  
  $img1-&gt;compositeImage($img2, imagick::COMPOSITE_DISSOLVE, 0, 0);
  $img1-&gt;writeImage("images/3.jpg");
  </code></pre>
  
  <p>This code works correctly on my Mac OS.</p>
  
  <p>But it doesn't work on remote server (Cent OS 6.5), the result image is same with 2.jpg.</p>
  
  <p>I tried with COMPOSITE_BLEND constant, it works well.</p>
  
  <p>And I tried the command in terminal.</p>
  
  <pre><code># composite -dissolve 50 2.jpg 1.jpg 3.jpg
  </code></pre>
  
  <p>It also works well.</p>
  
  <p>Why doesn't COMPOSITE_DISSOLVE constant work in PHP?</p>
  
  <p>Please help me.</p>