title: Converting images to a specific JPG quality
body: <p>I want to convert image formats to JPG in a specific quality</p>
  
  <p>The following command doesn't work for some reason , all i get is NULL</p>
  
  <p><code>gm convert -quality 80 '/tmp/phpK31vNK' JPEG:'/tmp/phpK31vNK' &amp;&amp; cat '/tmp/phpK31vNK'</code></p>
  
  <p>However the following command works fine but graphicsmagick set the default quality which is 75</p>
  
  <p><code>gm convert '/tmp/phpK31vNK' JPEG:'/tmp/phpK31vNK' &amp;&amp; cat '/tmp/phpK31vNK'</code></p>