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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"fig.savefig gives OverflowError for high DPI's","articleBody":"### Bug report\r\n\r\nEven with short timeseries, `fig.savefig()` throws an `OverflowError` for high dpi's. \r\nThe example below uses `'Agg'` with a significantly increased `chunksize`, yet it still throws an error for dpis \u003e 250.\r\n\r\n```python\r\nimport numpy as np\r\nimport matplotlib\r\nimport matplotlib.pyplot as plt\r\n\r\nmatplotlib.use('Agg')\r\nmatplotlib.rcParams['agg.path.chunksize'] = 20000000\r\n\r\nx = np.linspace(0, 100, 100000)\r\ny = np.random.randint(1, 100, 100000)\r\n\r\nfig = plt.figure()\r\nplt.plot(x, y)\r\n\r\ntry:\r\n    fig.savefig('Figure.png', format='png')\r\n    print('Successfully plotted without dpi')\r\nexcept Exception as e:\r\n    print(e)\r\ntry:\r\n    fig.savefig('Figure.png', format='png', dpi=500)\r\n    print('Successfully plotted with high dpi')\r\nexcept Exception as e:\r\n    print(e)\r\n```\r\nThe output here is:\r\n```python\r\nSuccessfully plotted without dpi\r\nExceeded cell block limit (set 'agg.path.chunksize' rcparam)\r\n\r\nProcess finished with exit code 0\r\n```\r\nwhereas I expected both to be successfully plotted, given that the chunksize OverflowError should only show when the number of plots exceeds the chunksize. \r\n\r\n\r\n**Matplotlib version**\r\n  * Operating system: Windows 10\r\n  * Matplotlib version: 3.3.3\r\n  * Matplotlib backend: agg\r\n  * Python version: 3..9.1\r\n  * Other libraries: NumPy 1.19.4\r\n  * Everything is installed with pip","author":{"url":"https://github.com/nielsuit227","@type":"Person","name":"nielsuit227"},"datePublished":"2021-01-20T11:29:25.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":12},"url":"https://github.com/19325/matplotlib/issues/19325"}