René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: inset colorbar colours and frame misaligned","articleBody":"### Bug summary\r\n\r\nFollowing #29340, when a colorbar is added in an inset axes there is still a small mismatch between the frame and the colours of the colorbar, as shown in the [test image added at #29340](https://github.com/rcomer/matplotlib/blob/0908973e108e945533b02f6ddf1f1227fbbf9b66/lib/matplotlib/tests/baseline_images/test_bbox_tight/bbox_inches_inset_rasterized.pdf).  That test uses the toolkits `inset_axes` but the problem also appears when using `Axes.inset_axes`.\r\n\r\n### Code for reproduction\r\n\r\nFrom https://github.com/matplotlib/matplotlib/issues/27763#issuecomment-1936312401:\r\n\r\n```Python\r\nimport matplotlib.pyplot as plt\r\nimport numpy as np\r\n\r\nfig, axes = plt.subplots(1, 1, layout='constrained')\r\n\r\nx = np.random.randint(100, size=(30, 200))\r\nc = axes.imshow(x, origin='lower', cmap='Reds', aspect=1)\r\naxins1 = axes.inset_axes([0.05, 0.8, 0.2, 0.09])\r\n\r\nfig.colorbar(c, cax=axins1, orientation=\"horizontal\")\r\n\r\nfig.savefig('test_single.pdf', bbox_inches='tight')\r\n```\r\n\r\n\r\n### Actual outcome\r\n\r\n![image](https://github.com/user-attachments/assets/e10dc8a4-c7f2-44a9-89bd-dc9a881dc11d)\r\n\r\n\r\n### Expected outcome\r\n\r\nColorbar frame should be lined up with its colours.\r\n\r\n### Additional information\r\n\r\nTo reproduce the bug we need\r\n* Rasterized artist in `inset_axes`\r\n* Saving with `bbox_inches='tight'`\r\n* Saving as pdf, so perhaps linked to the mixed-mode renderer calling `adjust_bbox` multiple times via `process_figure_for_rasterizing`.\r\n\r\nIncreasing the figure dpi to 300 makes the problem disappear.  Also, when I originally wrote the test at #29340 I forgot to set the style.  The problem did not show up with classic mode.\r\n\r\nI have reproduced with v3.2, so probably this never worked.\r\n\r\n### Operating system\r\n\r\nUbuntu\r\n\r\n### Matplotlib Version\r\n\r\n`main`\r\n\r\n### Matplotlib Backend\r\n\r\nQtAgg\r\n\r\n### Python version\r\n\r\n3.12.5\r\n\r\n### Jupyter version\r\n\r\nn/a\r\n\r\n### Installation\r\n\r\ngit checkout","author":{"url":"https://github.com/rcomer","@type":"Person","name":"rcomer"},"datePublished":"2024-12-28T12:36:30.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/29383/matplotlib/issues/29383"}