title: Image Compression tools via command line
body: <p>I'm searching best tool to compress images (png and jpeg) via command line.<br>
  After googling I found <strong>trimage</strong> which is good as it compresses both png and jepeg, but compression ratio is very poor in this case.    </p>
  
  <p>I came across <strong>jpeg-optimizer.com</strong> online tool which does the job way better than trimage. Can any one help to find the right tool for this. </p>