title: Need to convert png files to one pdf file
body: <p>I have one folder logos and it contains 200 png image files. 
  I need to convert all 200 ing file to one pdf. Please give me easy way to do it.
  I am using below command but it gives corrupted pdf with some image displayed and some of the pages blank.
  Please give me alternate command to run in my linux server.</p>
  
  <pre><code>convert *.png +compress logos.pdf
  </code></pre>