René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Unexpected behaviour of imshow default interpolation","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\nArtifacts appear when plotting periodic data with discontinuities, i.e. something like x mod 1.0   \r\nThe bug appears at when render resolution is relatively small comparing to the real resolution of the data (downsampling problem?).\r\n\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\nimport numpy as np\r\nimport matplotlib.pyplot as plt\r\n\r\nxx, yy = np.meshgrid(np.linspace(-5, 5, 201), np.linspace(-5, 5, 201))\r\npsi = xx % 1.0\r\n\r\nplt.figure()\r\nplt.imshow(psi, cmap=\"twilight\")\r\nplt.savefig(\"small.png\", dpi=100)\r\nplt.savefig(\"large.png\", dpi=200)\r\n```\r\n\r\n**Outcome**\r\n\r\n \r\n\r\n\u003cimg src=\"https://user-images.githubusercontent.com/11896426/113173843-173c6000-924a-11eb-907f-3bb546a0941b.png\"  alt=\"alt text\" width=\"40%\"\u003e \u003cimg src=\"https://user-images.githubusercontent.com/11896426/113173851-199eba00-924a-11eb-95b4-97b2b6262ed7.png\"  alt=\"alt text\" width=\"40%\"\u003e \r\n\r\n(large.png, small.png)\r\n\r\n**Matplotlib version**\r\n\r\nThe issue is repeatable locally and in CoLab:\r\n\r\n\u003c!--Please specify your platform and versions of the relevant libraries you are using:--\u003e\r\n  * Operating system: Linux\r\n  * Matplotlib version: 3.3.3, 3.2.2\r\n  * Matplotlib backend (): TkAgg, ipykernel.pylab.backend_inline \r\n  * Python version: 3.8.5, 3.7\r\n\r\n","author":{"url":"https://github.com/Trel725","@type":"Person","name":"Trel725"},"datePublished":"2021-03-31T16:02:08.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/19838/matplotlib/issues/19838"}