title: How to find and extract "main" image in website
body: <p>I need help tackling a problem. I need a program which, given a site, finds and extracts the "main" picture, i.e. the one which represents the site. (To say it is the <em>biggest</em> or the <em>first</em> picture is sometimes but not always true).</p>
  
  <p>How should I approach this? Are there any libraries that could help me with this?
  Thanks!</p>