René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Figure.add_artist() fails to re-render an image previously added via Figure.figimage() after .remove()","articleBody":"### Bug summary\n\nAfter calling `.remove()` on the `FigureImage` object returned by `Figure.figimage(...)` and then re-attaching it via `Figure.add_artist(...)`, the image is no longer rendered in the saved figure. The same remove/re-add cycle works correctly for a `Text` artist created via `Figure.text(...)`, suggesting `figimage` objects are not properly handled by `Figure.add_artist`.\n\n### Code for reproduction\n\n```Python\nimport matplotlib.pyplot as plt\nfrom matplotlib.figure import Figure\nfrom io import BytesIO\n\ndef text_to_rgba(s, *, dpi, **kwargs):\n    fig = Figure(facecolor=\"none\")\n    fig.text(0, 0, s, **kwargs)\n    with BytesIO() as buf:\n        fig.savefig(buf, dpi=dpi, format=\"png\", bbox_inches=\"tight\",\n                    pad_inches=0)\n        buf.seek(0)\n        rgba = plt.imread(buf)\n    return rgba\n\n# --- Case 1: figimage ---\nfig, ax = plt.subplots()\nrgba1 = text_to_rgba(r\"IQ: $\\sigma_i=15$\", color=\"blue\", fontsize=10, dpi=200)\nfigimg = fig.figimage(rgba1, 100, 50)\nplt.savefig(\"figimage_before.png\")   # image visible (correct)\nfigimg.remove()\nfig.add_artist(figimg)\nplt.savefig(\"figimage_after.png\")    # image MISSING (bug)\n\n# --- Case 2: text (control) ---\nfig, ax = plt.subplots()\nmytext = fig.text(0.2, 0.15, r\"IQ: $\\sigma_i=15$\", color=\"blue\", fontsize=20)\nplt.savefig(\"text_before.png\")       # text visible (correct)\nmytext.remove()\nfig.add_artist(mytext)\nplt.savefig(\"text_after.png\")        # text visible (correct)\n```\n\n### Actual outcome\n\n#### figimage_before.png\n\n\u003cimg width=\"640\" height=\"480\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/a17fb911-4773-4ae1-b206-854ae98c1ea9\" /\u003e\n\n#### figimage_after.png\n\n\u003cimg width=\"640\" height=\"480\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/d9be189a-c10d-4386-a6fa-fa161071f74b\" /\u003e\n\n### Expected outcome\n\n#### figimage_before.png\n\n\u003cimg width=\"640\" height=\"480\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/a17fb911-4773-4ae1-b206-854ae98c1ea9\" /\u003e\n\n#### figimage_after.png\n\n\u003cimg width=\"640\" height=\"480\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/a17fb911-4773-4ae1-b206-854ae98c1ea9\" /\u003e\n\n### Additional information\n\n_No response_\n\n### Operating system\n\n_No response_\n\n### Matplotlib Version\n\n0.2.0.dev54524+unknown.ga94275af4\n\n### Matplotlib Backend\n\n_No response_\n\n### Python version\n\n_No response_\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\nNone","author":{"url":"https://github.com/williamlus","@type":"Person","name":"williamlus"},"datePublished":"2026-05-22T12:50:56.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":8},"url":"https://github.com/31730/matplotlib/issues/31730"}