René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Inverted imshow using Cairo backend","articleBody":"In testing some stuff for #7151, I realized that the Cairo backend inverts images plotted using `imshow`.\n\n``` python\nimport matplotlib as mpl\nmpl.use('Cairo')\nimport numpy as np\nimport matplotlib.pyplot as plt\n\na = np.random.randn(3,3)\n\nim1 = plt.imshow(a, extent = [0,1,0,1])\nplt.xlim(0,2.2)\nplt.ylim(0,2.2)\n\nplt.savefig('test.png')\n```\n\nIt doesn't really matter if saving as png or pdf, the outcome is the same. With Agg, the image appears in the lower left corner:\n![test](https://cloud.githubusercontent.com/assets/302469/18736364/627d4f5a-8054-11e6-9698-4be3ebe8e4ab.png)\nWith Cairo, the image appears in the upper left corner:\n![test](https://cloud.githubusercontent.com/assets/302469/18736371/790b7800-8054-11e6-82c0-a03097fb30f6.png)\n\nIt worked correctly with mpl 1.4.3 and is broken with 1.5.0, but bisection is next to impossible because the Cairo backend was broken for a very long time.\n","author":{"url":"https://github.com/QuLogic","@type":"Person","name":"QuLogic"},"datePublished":"2016-09-22T03:41:52.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/7156/matplotlib/issues/7156"}