title: Figures does not appear in original size in pdf format converted by ReStructuredText
body: <p>I am creating a documentation using ReStructuredText (rst) format. I convert the documentation to pdf format with <a href="https://github.com/rst2pdf/rst2pdf" rel="nofollow">this</a> rst converter. When I try to link a figure, it does not appear in the original size of image in pdf format. All the displayed images are very small, but I use relative big images (.png and .jpg) for example with the width of 470px and height of 520px. If I multiply the width and the height of an image by three, it appears in the desired size, but I am of the opinion that it is not the proper way to solve this. I also tried to look for solution over the internet, but I have not found any. Would anyone be so kind as to help me in this matter? Thanks in advance!</p>
  
  <p>Example code:</p>
  
  <pre><code>.. figure:: img/device_manager.jpg
      :align: center
      :alt: Run window
      :width: 470px
      :height: 520px
      :scale: 100
  </code></pre>