René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Setting alpha with an array is ignored with jupyterlab %inline backend","articleBody":"### Bug summary\n\nIf alpha is set as an array (of equal shape as the image data), the alpha value is ignored.\nThis is failing for inline plots in Jupyter Lab.\n\n### Code for reproduction\n\n```Python\nimport matplotlib\nprint(matplotlib.__version__)\n\nimport numpy as np\nimport matplotlib.pyplot as plt\n\nimg_data = np.random.rand(256, 200)\nalpha = np.ones((256, 200))\nalpha[:, 0:100] = 0.5\nfig, ax = plt.subplots(1, 2, figsize=(10, 8))\nax[0].imshow(img_data, alpha=alpha)\nax[1].imshow(alpha)\n```\n\n### Actual outcome\n\n\u003cimg width=\"894\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/dde97c0a-f48b-436f-ad7d-174784bae280\" /\u003e\n\n### Expected outcome\n\n\u003cimg width=\"869\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/2afff9fe-b9bf-465f-9013-3deda8de3f1a\" /\u003e\n\n### Additional information\n\nWorked with Matplotlib 3.9.4 with numpy 2.2.1 \nFails in matplotlib 3.10.0 (same numpy), running in a Jupyter Lab cell. \nWorked as expected when run from the command line, with backend 'macosx', or if `%matplotlib osx` or `%matplotlib ipympl` is used to decorate the cell before running the code above. \n\n\n### Operating system\n\nOS/X\n\n### Matplotlib Version\n\n3.10.0\n\n### Matplotlib Backend\n\ninline\n\n### Python version\n\n3.13.1\n\n### Jupyter version\n\n4.3.4\n\n### Installation\n\nconda","author":{"url":"https://github.com/rhiannonlynne","@type":"Person","name":"rhiannonlynne"},"datePublished":"2025-02-09T02:21:38.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/29595/matplotlib/issues/29595"}