title: Changing image size in Markdown
body: <p>I just got started with Markdown. I love it, but there is one thing bugging me: How can I change the size of an image using Markdown?</p>
  
  <p>The documentation only gives the following suggestion for an image: </p>
  
  <pre><code>![drawing](drawing.jpg)
  </code></pre>
  
  <p>If it is possible I would like the picture to also be centered. I am asking for general Markdown, not just how GitHub does it. </p>