title: Appending images using ImageMagick convert
body: <p>So I have a bunch of images that I wish to append vertically:</p>
  
  <pre><code>convert *.png -append output.png
  </code></pre>
  
  <p>However I ran into two problems:</p>
  
  <ol>
  <li>Not all the images are of the same width. Hence images smaller in width than the widest image have white space trailing after them because they are left-aligned.</li>
  <li>There's no spacing between the images.</li>
  </ol>
  
  <p>How do you center align all the images and specify spacing between them?</p>