title: background color of JPG using wand (Python)
body: <p>I use wand with Python to change the background color of a JPEG.</p>
  <pre class="lang-py prettyprint-override"><code>with Image(file=myJpg) as image:
      image.background_color = Color(&quot;#f0f0f0&quot;)
      image.save(filename='myJpg.jpg')
  </code></pre>
  <p>It seems to work because when I resize and extent image the background is filled with &quot;#f0f0f0&quot; (rgb(240,240,240)).</p>
  <p>The image is a JPEG.</p>
  <p>If I reload the image and get the background, it is white rgb(255,255,255):</p>
  <pre class="lang-py prettyprint-override"><code>with Image(file=myJpg) as img:
      assert img.background_color == Color(&quot;#f0f0f0&quot;)
  </code></pre>
  <p>The assertion is false. I don't understand why?</p>