Bug report

Bug summary

While saving a figure using savefig, the flag for transparency is ignored, and the resulting PNG has a transparent background, even though transparency is set to False.

Note: This affect matplotlib 3.1.0. The error did not occur in 3.0.3 on the same machine as described bellow.

Code for reproduction

# Paste your code here
from matplotlib import peplos as plt
fig = plt.figure(figsize=[20, 10], frameon=False)
fig.savefig('./test.png', transparent=False)
plt.close()

Actual outcome

An empty PNG file, that is transparent.

Expected outcome

An empty PNG file with only a white background.

Matplotlib version

• Operating system: macOS 10.14.5 / CentOS 6.
• Matplotlib version: 3.1.0
• Matplotlib backend (print(matplotlib.get_backend())): module://backend_interagg
• Python version: 3.6.1
• Jupyter version (if applicable):
• Other libraries:

Python was installed via pyenv (compiled from source), and matplotlib was installed through pipenv.