René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: I give an RGB image to imsave but I don't have the right color map!","articleBody":"### Bug summary\r\n\r\nWhen I give an RGB image as a list of list of list to imsave, I don't have the right colormap and there is no rgb colormap!\r\n\r\n### Code for reproduction\r\n\r\n```Python\r\nimport matplotlib.pyplot as plt\r\nI = plt.imread(\"notre-dame.jpg\")\r\nm,n,p = I.shape #m=largeur, n=hauteur, p=uplet\r\nJ=[[[0 for d in range(p)] for e in range(n)] for f in range(m)]\r\nK=[[[0 for d in range(p)] for e in range(n)] for f in range(m)]\r\nL=[[[0 for d in range(p)] for e in range(n)] for f in range(m)]\r\nfor i in range(m) :\r\n    for j in range(n) :\r\n        J[i][j]=[int(I[i][j][0]),0,0]\r\n        K[i][j]=[0,int(I[i][j][1]),0]\r\n        L[i][j]=[0,0,int(I[i][j][2])]\r\nfig, ax=plt.subplots(4,figsize=(28,10))\r\nax[0].imshow(I)\r\nax[1].imshow(J)\r\nax[2].imshow(K)\r\nax[3].imshow(L)\r\nax[0].set_axis_off()\r\nax[1].set_axis_off()\r\nax[2].set_axis_off()\r\nax[3].set_axis_off()\r\nax[0].set_title('Image complete')\r\nax[1].set_title('Composante rouge')\r\nax[2].set_title('Composante bleue')\r\nax[3].set_title('Composante verte')\r\nfig.suptitle(\"Image de Notre-Dame\", x=0.51,y=.93)\r\nplt.imsave(\"Notre-Dame_rouge.png\",J) #The problem is here!\r\nplt.savefig(\"Notre-Dame_composante_ex1.png\",dpi=750,bbox_inches=\"tight\")\r\nplt.savefig(\"Notre-Dame_composante_ex1.pdf\",dpi=750,bbox_inches=\"tight\")\r\nplt.show()\r\n```\r\n\r\n\r\n### Actual outcome\r\n\r\n![Notre-Dame_rouge](https://github.com/user-attachments/assets/8d7c2ca4-c1a1-41e5-a3f6-736c6f1b6b59)\r\n\r\n\r\n### Expected outcome\r\n\r\n![Notre-Dame_composante_ex1](https://github.com/user-attachments/assets/066b8514-243f-461f-b064-e1b726d42590)\r\nThe red one in a png image!\r\n\r\n### Additional information\r\n\r\n![notre-dame](https://github.com/user-attachments/assets/e23ae1d2-f169-4d59-a06b-dd844287fd30)\r\nThe original image\r\n\r\n### Operating system\r\n\r\nWin 11\r\n\r\n### Matplotlib Version\r\n\r\n3.9.2\r\n\r\n### Matplotlib Backend\r\n\r\nmodule://matplotlib_inline.backend_inline\r\n\r\n### Python version\r\n\r\n3.11.10\r\n\r\n### Jupyter version\r\n\r\n_No response_\r\n\r\n### Installation\r\n\r\nconda","author":{"url":"https://github.com/zef126","@type":"Person","name":"zef126"},"datePublished":"2024-11-24T23:04:57.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":28},"url":"https://github.com/29183/matplotlib/issues/29183"}