René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Behavior of masked values in colormap plot has changed in 2.2.0","articleBody":"### Bug report\r\n\r\n**Bug summary**\r\n\r\nSomething changed the behavior of masked values in colormaps. Before, masked values on a 'jet' colormap would be drawn as white (and could be set to different colors with set_bad). This is no longer the case on matplotlib 2.2.0 - the masked values are being printed out as blue, the same color as valid values, and set_bad has no effect. Verified former behavior to be working on 2.1.1 and 2.0.2. \r\n\r\nNot sure this is an issue or expected behavior, but I couldn't find a description of this behavior change anywhere. Please close if this is expected.\r\n\r\nChanging interpolation from gaussian to none makes no difference (the sample code was originally used for another bug)\r\n\r\n**Code for reproduction**\r\n\r\n```python\r\nimport matplotlib.pyplot as plt\r\nimport matplotlib.colors\r\n\r\nheatmap = [[0] * 32 for _ in range(128)]\r\ncnt = 0\r\nlast = 1\r\nfor lvl in range(127):\r\n    if lvl % 20 \u003c 10:\r\n        for i in range(32):\r\n            heatmap[lvl][i] = 40\r\n    else:\r\n        for i in range(32):\r\n            heatmap[lvl][i] = 0\r\njet = plt.get_cmap('jet')\r\njet.set_bad('white', 1)\r\n\r\nplt.imshow(heatmap, origin='lower', interpolation='gaussian', aspect='auto', cmap=jet,\r\n                 norm=matplotlib.colors.LogNorm())\r\nplt.show()\r\n```\r\n\r\n**Actual outcome**\r\n\r\n![image](https://user-images.githubusercontent.com/1119915/38695125-396900a4-3e40-11e8-819c-13c556c53c81.png)\r\n\r\n**Expected outcome**\r\n\r\n![image](https://user-images.githubusercontent.com/1119915/38695159-4c4c3b28-3e40-11e8-867e-8148ff8ed525.png)\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: Windows\r\n  * Matplotlib version: 2.2.0\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): TkAgg\r\n  * Python version:3.6.3\r\n  * Jupyter version (if applicable):\r\n  * Other libraries: \r\n\r\nInstalled from pip\r\n","author":{"url":"https://github.com/arthur00","@type":"Person","name":"arthur00"},"datePublished":"2018-04-12T18:03:15.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":11},"url":"https://github.com/11039/matplotlib/issues/11039"}