title: Label and legend issue in jqplotToImageStr
body: <p>I am trying to pass a few jqplots to a server and generate pdf. The plots looks good when they are first generated. But when I used <code>jqplotToImageStr</code> to digitize them, they were not properly scaled, and so did the generated pdf. So my question is how to set the plot size/dimension when I digitize these plots.</p>
  
  <p>Commend I used to digitize</p>
  
  <pre><code>var imgData = [];
  imgData.push($('#chart1').jqplotToImageStr({}));
  </code></pre>
  
  <p>Before digitize 
  <img src="https://i.stack.imgur.com/Rz1kd.png" alt="enter image description here"></p>
  
  <p>After
  <img src="https://i.stack.imgur.com/JmyHp.png" alt="enter image description here"></p>
  
  <p>After adding options<img src="https://i.stack.imgur.com/MIuag.png" alt="enter image description here"></p>