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Commit 40a5a75

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Merge pull request #20376 from anntzer/ca
2 parents 89ce4fb + 3124bda commit 40a5a75
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‎examples/user_interfaces/canvasagg.py

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the backend to "Agg" would be sufficient.
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In this example, we show how to save the contents of the agg canvas to a file,
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and how to extract them to a string, which can in turn be passed off to PIL or
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put in a numpy array. The latter functionality allows e.g. to use Matplotlib
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inside a cgi-script *without* needing to write a figure to disk.
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and how to extract them to a numpy array, which can in turn be passed off
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to Pillow_. The latter functionality allows e.g. to use Matplotlib inside a
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cgi-script *without* needing to write a figure to disk, and to write images in
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any format supported by Pillow.
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.. _Pillow: https://pillow.readthedocs.io/
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"""
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from matplotlib.backends.backend_agg import FigureCanvasAgg
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# etc.).
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fig.savefig("test.png")
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# Option 2: Retrieve a view on the renderer buffer...
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# Option 2: Retrieve a memoryview on the renderer buffer, and convert it to a
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# numpy array.
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canvas.draw()
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buf = canvas.buffer_rgba()
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# ... convert to a NumPy array ...
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X = np.asarray(buf)
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rgba = np.asarray(canvas.buffer_rgba())
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# ... and pass it to PIL.
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im = Image.fromarray(X)
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im = Image.fromarray(rgba)
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# This image can then be saved to any format supported by Pillow, e.g.:
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im.save("test.bmp")
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# Uncomment this line to display the image using ImageMagick's `display` tool.
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# im.show()

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