title: wkhtmltoimage generate image flie but can not show chinese character but pdf can
body: <p>I used wkhtmltoimage to generate image, then I input command</p>
  
  <ol>
  <li><p>wkhtmltoimage <a href="http://www.baidu.com/tmp/screenshot.jpg" rel="nofollow">http://www.baidu.com/tmp/screenshot.jpg</a></p></li>
  <li><p>wkhtmltopdf <a href="http://www.baidu.com/tmp/screenshot.pdf" rel="nofollow">http://www.baidu.com/tmp/screenshot.pdf</a></p></li>
  </ol>
  
  <p>The result is Chinese character could not show.</p>
  
  <p>The version:</p>
  
  <pre><code>wkhtmltopdf   wkhtmltopdf 0.9.6
  wkhtmltoimage  wkhtmltoimage 0.11.0 rc1
  </code></pre>
  
  <p>Can anyone help me? Any help will be appreciated;</p>