René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Incorrect PDF output with rasterized=True","articleBody":"The following example demonstrates an issue with the PDF output when setting `rasterized=True`:\n\n```\nimport numpy as np\nimport matplotlib.pyplot as plt\nfrom matplotlib.collections import LineCollection\n\nfig = plt.figure()\nax = fig.add_subplot(1,1,1)\nz = np.random.random((100000, 3, 2))\nlc = LineCollection(z, rasterized=True, alpha=0.01, color='k')\nax.add_collection(lc)\nfig.savefig('test.png')\nfig.savefig('test.pdf')\n```\n\nThe PNG output is:\n\n![test](https://cloud.githubusercontent.com/assets/314716/3934165/2c89dcd0-2488-11e4-88cf-cfebad36a17b.png)\n\nThe PDF output (converted to PNG, looks the same), is:\n\n![test_pdf](https://cloud.githubusercontent.com/assets/314716/3934169/35e64afc-2488-11e4-865b-503a3eb99cd2.png)\n\nFor some reason, the PDF output appears gray not black in the center.\n","author":{"url":"https://github.com/astrofrog","@type":"Person","name":"astrofrog"},"datePublished":"2014-08-15T14:28:06.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":30},"url":"https://github.com/3371/matplotlib/issues/3371"}