René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"macosx backend color rendering","articleBody":"With the macosx backend, images and patches are shown on screen with different color rendering. The Qt backend does work fine. The following script displays an image of a grayscale (np.array) overlaid at the center with the same grayscale generated from matplotlib.patches.\n\nThere is a difference of gamma between the image and the patches on what's displayed on screen but if I save this figure, then the resulting file is correct. Checking with some graphic software, the patches are displaying the correct color, not the image.\n\nSnapshot: ![](http://i.stack.imgur.com/mv8aU.jpg)\n\nSaving the figure from the figure window 'save' button gives this:\n![](http://i.stack.imgur.com/fVNnh.png)\n\nHere's the code to test:\n\n```\nimport numpy as np\nimport matplotlib.pyplot as plt\nfrom matplotlib.patches import Rectangle\n\ncolor = np.zeros(3)\n\nf, ax = plt.subplots()\nim = np.zeros((1000, 1100,3))\nfor i in range(11):\n    im[:,i*100:(i+1)*100,:] = np.tile(np.array([[color]]), (1000, 100, 1))\n    ax.add_patch(Rectangle((i*100,300), 100, 400, linewidth=0, facecolor=color))\n    color = color + 0.1\nplt.imshow(im)\nplt.show()\n```\n","author":{"url":"https://github.com/jaguarondi","@type":"Person","name":"jaguarondi"},"datePublished":"2016-01-13T17:37:11.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/5847/matplotlib/issues/5847"}