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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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<title>Agg Buffer — Matplotlib 3.4.2 documentation</title>
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<div id="unreleased-message"> You are reading an old version of the documentation (v3.4.2). For the latest version see <a href="https://matplotlib.org/stable/gallery/misc/agg_buffer.html">https://matplotlib.org/stable/gallery/misc/agg_buffer.html</a></div>
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<div class="sphx-glr-example-title section" id="agg-buffer">
<span id="sphx-glr-gallery-misc-agg-buffer-py"></span><h1>Agg Buffer<a class="headerlink" href="#agg-buffer" title="Permalink to this headline">¶</a></h1>
<p>Use backend agg to access the figure canvas as an RGBA buffer, convert it to an
array, and pass it to Pillow for rendering.</p>
<img alt="agg buffer" class="sphx-glr-single-img" src="../../_images/sphx_glr_agg_buffer_001.png" />
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</span>
<span class="kn">from</span> <span class="nn">matplotlib.backends.backend_agg</span> <span class="kn">import</span> <a href="../../api/backend_agg_api.html#matplotlib.backends.backend_agg.FigureCanvasAgg" title="matplotlib.backends.backend_agg.FigureCanvasAgg" class="sphx-glr-backref-module-matplotlib-backends-backend_agg sphx-glr-backref-type-py-class"><span class="n">FigureCanvasAgg</span></a>
<span class="kn">import</span> <span class="nn">matplotlib.pyplot</span> <span class="k">as</span> <span class="nn">plt</span>
<a href="../../api/_as_gen/matplotlib.pyplot.plot.html#matplotlib.pyplot.plot" title="matplotlib.pyplot.plot" class="sphx-glr-backref-module-matplotlib-pyplot sphx-glr-backref-type-py-function"><span class="n">plt</span><span class="o">.</span><span class="n">plot</span></a><span class="p">([</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">])</span>
<a href="../../api/backend_agg_api.html#matplotlib.backends.backend_agg.FigureCanvasAgg" title="matplotlib.backends.backend_agg.FigureCanvasAgg" class="sphx-glr-backref-module-matplotlib-backends-backend_agg sphx-glr-backref-type-py-class sphx-glr-backref-instance"><span class="n">canvas</span></a> <span class="o">=</span> <a href="../../api/_as_gen/matplotlib.pyplot.gcf.html#matplotlib.pyplot.gcf" title="matplotlib.pyplot.gcf" class="sphx-glr-backref-module-matplotlib-pyplot sphx-glr-backref-type-py-function"><span class="n">plt</span><span class="o">.</span><span class="n">gcf</span></a><span class="p">()</span><span class="o">.</span><a href="../../api/backend_agg_api.html#matplotlib.backends.backend_agg.FigureCanvasAgg" title="matplotlib.backends.backend_agg.FigureCanvasAgg" class="sphx-glr-backref-module-matplotlib-backends-backend_agg sphx-glr-backref-type-py-class sphx-glr-backref-instance"><span class="n">canvas</span></a>
<a href="../../api/backend_agg_api.html#matplotlib.backends.backend_agg.FigureCanvasAgg" title="matplotlib.backends.backend_agg.FigureCanvasAgg" class="sphx-glr-backref-module-matplotlib-backends-backend_agg sphx-glr-backref-type-py-class sphx-glr-backref-instance"><span class="n">agg</span></a> <span class="o">=</span> <a href="../../api/backend_bases_api.html#matplotlib.backend_bases.FigureCanvasBase.switch_backends" title="matplotlib.backend_bases.FigureCanvasBase.switch_backends" class="sphx-glr-backref-module-matplotlib-backend_bases sphx-glr-backref-type-py-method"><span class="n">canvas</span><span class="o">.</span><span class="n">switch_backends</span></a><span class="p">(</span><a href="../../api/backend_agg_api.html#matplotlib.backends.backend_agg.FigureCanvasAgg" title="matplotlib.backends.backend_agg.FigureCanvasAgg" class="sphx-glr-backref-module-matplotlib-backends-backend_agg sphx-glr-backref-type-py-class"><span class="n">FigureCanvasAgg</span></a><span class="p">)</span>
<a href="../../api/backend_agg_api.html#matplotlib.backends.backend_agg.FigureCanvasAgg.draw" title="matplotlib.backends.backend_agg.FigureCanvasAgg.draw" class="sphx-glr-backref-module-matplotlib-backends-backend_agg sphx-glr-backref-type-py-method"><span class="n">agg</span><span class="o">.</span><span class="n">draw</span></a><span class="p">()</span>
<a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.ndarray.html#numpy.ndarray" title="numpy.ndarray" class="sphx-glr-backref-module-numpy sphx-glr-backref-type-py-class sphx-glr-backref-instance"><span class="n">X</span></a> <span class="o">=</span> <a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.asarray.html#numpy.asarray" title="numpy.asarray" class="sphx-glr-backref-module-numpy sphx-glr-backref-type-py-function"><span class="n">np</span><span class="o">.</span><span class="n">asarray</span></a><span class="p">(</span><a href="../../api/backend_agg_api.html#matplotlib.backends.backend_agg.FigureCanvasAgg.buffer_rgba" title="matplotlib.backends.backend_agg.FigureCanvasAgg.buffer_rgba" class="sphx-glr-backref-module-matplotlib-backends-backend_agg sphx-glr-backref-type-py-method"><span class="n">agg</span><span class="o">.</span><span class="n">buffer_rgba</span></a><span class="p">())</span>
<span class="c1"># Pass off to PIL.</span>
<span class="kn">from</span> <span class="nn">PIL</span> <span class="kn">import</span> <span class="n">Image</span>
<span class="n">im</span> <span class="o">=</span> <span class="n">Image</span><span class="o">.</span><span class="n">fromarray</span><span class="p">(</span><a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.ndarray.html#numpy.ndarray" title="numpy.ndarray" class="sphx-glr-backref-module-numpy sphx-glr-backref-type-py-class sphx-glr-backref-instance"><span class="n">X</span></a><span class="p">)</span>
<span class="c1"># Uncomment this line to display the image using ImageMagick's `display` tool.</span>
<span class="c1"># im.show()</span>
</pre></div>
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<a class="reference download internal" download="" href="../../_downloads/3cc6fec5c2863ce9fad2f17b352c0da5/agg_buffer.py"><code class="xref download docutils literal notranslate"><span class="pre">Download</span> <span class="pre">Python</span> <span class="pre">source</span> <span class="pre">code:</span> <span class="pre">agg_buffer.py</span></code></a></div>
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<a class="reference download internal" download="" href="../../_downloads/0b0fe3533b924ef7ae5df1a81f3ac8be/agg_buffer.ipynb"><code class="xref download docutils literal notranslate"><span class="pre">Download</span> <span class="pre">Jupyter</span> <span class="pre">notebook:</span> <span class="pre">agg_buffer.ipynb</span></code></a></div>
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