title: matplotlib inline facecolor not working on savefig
body: <p>I'm trying to get my jupyter/python/%matplotlib charts to work with a dark background. I want to set a white background color for the full image rather than the default transparent.</p>
  
  <pre><code>%matplotlib notebook
  import matplotlib.pyplot as plt
  fig, ax = plt.subplots()
  fig.savefig('dummy.png', facecolor='w', transparent=False)
  </code></pre>
  
  <p>The standard response is to use facecolor, but that isn't doing the trick <a href="https://imgur.com/a/DSln6" rel="nofollow noreferrer">here</a>.</p>