René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Transparency always on for PNG in version 3.1.0","articleBody":"\u003c!--To help us understand and resolve your issue, please fill out the form to the best of your ability.--\u003e\r\n\u003c!--You can feel free to delete the sections that do not apply.--\u003e\r\n\r\n### Bug report\r\n\r\n**Bug summary**\r\n\r\nWhile 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`.\r\n\u003c!--A short 1-2 sentences that succinctly describes the bug--\u003e\r\n\r\nNote: This affect matplotlib 3.1.0. The error did not occur in 3.0.3 on the same machine as described bellow.\r\n\r\n**Code for reproduction**\r\n\r\n\u003c!--A minimum code snippet required to reproduce the bug.\r\nPlease make sure to minimize the number of dependencies required, and provide\r\nany necessary plotted data.\r\nAvoid using threads, as Matplotlib is (explicitly) not thread-safe.--\u003e\r\n\r\n```python\r\n# Paste your code here\r\nfrom matplotlib import peplos as plt\r\nfig = plt.figure(figsize=[20, 10], frameon=False)\r\nfig.savefig('./test.png', transparent=False)\r\nplt.close()\r\n```\r\n\r\n**Actual outcome**\r\n\r\n\u003c!--The output produced by the above code, which may be a screenshot, console output, etc.--\u003e\r\n\r\nAn empty PNG file, that is transparent.\r\n\r\n**Expected outcome**\r\n\r\nAn empty PNG file with only a white background.\r\n\u003c!--A description of the expected outcome from the code snippet--\u003e\r\n\u003c!--If this used to work in an earlier version of Matplotlib, please note the version it used to work on--\u003e\r\n\r\n**Matplotlib version**\r\n\u003c!--Please specify your platform and versions of the relevant libraries you are using:--\u003e\r\n  * Operating system: macOS 10.14.5 / CentOS 6.\r\n  * Matplotlib version: 3.1.0\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): module://backend_interagg\r\n  * Python version: 3.6.1\r\n  * Jupyter version (if applicable):\r\n  * Other libraries: \r\n\r\n\u003c!--Please tell us how you installed matplotlib and python e.g., from source, pip, conda--\u003e\r\nPython was installed via pyenv (compiled from source), and matplotlib was installed through pipenv.\r\n\r\n\u003c!--If you installed from conda, please specify which channel you used if not the default--\u003e\r\n","author":{"url":"https://github.com/cLupus","@type":"Person","name":"cLupus"},"datePublished":"2019-05-27T06:37:55.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":12},"url":"https://github.com/14339/matplotlib/issues/14339"}