René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Doesn't show 1-channel image by using matplotlib.image.AxesImage.set_data()","articleBody":"### Bug summary\r\n\r\nI could not plot a 1-channel image while I was trying to populate a Subplots figure, although I can visualize it by using plt.imshow().\r\n\r\n### Code for reproduction\r\n\r\n```python\r\nfig, axes = plt.subplots(3, 2, num=0)\r\n# fig.canvas.mpl_connect('key_press_event', on_press)\r\n\r\nh, w = image_size\r\nh, w = int(h), int(w)\r\n\r\nax1 = axes[0][0].imshow(np.zeros((h, w, 3), dtype=np.float32))\r\nax2 = axes[0][1].imshow(np.zeros((h, w, 3), dtype=np.float32))\r\nax3 = axes[1][0].imshow(np.zeros((h, w, 3), dtype=np.float32))\r\nax4 = axes[1][1].imshow(np.zeros((h, w, 3), dtype=np.float32))\r\nax5 = axes[2][0].imshow(np.zeros((h, w), dtype=np.float32)) \r\nax6 = axes[2][1].imshow(np.zeros((h, w), dtype=np.float32))\r\n\r\nimage_np = \u003c(h,w) uint8 or float32\u003e\r\nimage_pil = Image.fromarray(image_np).convert('RGB')\r\n\r\n...\r\n# ax5.set_data(image_np)  # Fails!\r\n# ax5.set_data(image_pil)  # Works!\r\nplt.imshow(image_np)  # Works!\r\nplt.draw()\r\nplt.pause(1e-9)\r\n```\r\n\r\n\r\n### Actual outcome\r\n\r\n![matplotlib_bug](https://user-images.githubusercontent.com/7122146/162533518-7668512e-70b4-4bad-8cfb-cef770359b51.jpeg)\r\n\r\n\r\n### Expected outcome\r\n\r\nI used the Paint to generate the following image to demonstrate what I was expecting.\r\n\r\n![matplotlib_fix_paint](https://user-images.githubusercontent.com/7122146/162533708-843f2c61-6d8e-4076-af10-813652ee8132.jpeg)\r\n\r\n\r\n### Additional information\r\n\r\n_No response_\r\n\r\n### Operating system\r\n\r\nUbuntu 20.04\r\n\r\n### Matplotlib Version\r\n\r\n3.5.1\r\n\r\n### Matplotlib Backend\r\n\r\nTkAgg\r\n\r\n### Python version\r\n\r\nPython 3.8.10\r\n\r\n### Jupyter version\r\n\r\n_No response_\r\n\r\n### Installation\r\n\r\npip","author":{"url":"https://github.com/nicolasrosa","@type":"Person","name":"nicolasrosa"},"datePublished":"2022-04-08T21:23:39.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":13},"url":"https://github.com/22808/matplotlib/issues/22808"}