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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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<title>Agg Buffer — Matplotlib 2.2.0 documentation</title>
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<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 RGB string and then
convert it to an array and pass it to Pillow for rendering.</p>
<img alt="../../_images/sphx_glr_agg_buffer_001.png" class="align-center" src="../../_images/sphx_glr_agg_buffer_001.png" />
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">numpy</span> <span class="kn">as</span> <span class="nn">np</span>
<span class="kn">import</span> <span class="nn">matplotlib.pyplot</span> <span class="kn">as</span> <span class="nn">plt</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="View documentation for matplotlib.backends.backend_agg.FigureCanvasAgg"><span class="n">FigureCanvasAgg</span></a>
<span class="k">try</span><span class="p">:</span>
<span class="kn">from</span> <span class="nn">PIL</span> <span class="kn">import</span> <span class="n">Image</span>
<span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">SystemExit</span><span class="p">(</span><span class="s2">"Pillow must be installed to run this example"</span><span class="p">)</span>
<a href="../../api/_as_gen/matplotlib.pyplot.plot.html#matplotlib.pyplot.plot" title="View documentation for matplotlib.pyplot.plot"><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>
<span class="n">canvas</span> <span class="o">=</span> <a href="../../api/_as_gen/matplotlib.pyplot.get_current_fig_manager.html#matplotlib.pyplot.get_current_fig_manager" title="View documentation for matplotlib.pyplot.get_current_fig_manager"><span class="n">plt</span><span class="o">.</span><span class="n">get_current_fig_manager</span></a><span class="p">()</span><span class="o">.</span><span class="n">canvas</span>
<span class="n">agg</span> <span class="o">=</span> <span class="n">canvas</span><span class="o">.</span><span class="n">switch_backends</span><span class="p">(</span><a href="../../api/backend_agg_api.html#matplotlib.backends.backend_agg.FigureCanvasAgg" title="View documentation for matplotlib.backends.backend_agg.FigureCanvasAgg"><span class="n">FigureCanvasAgg</span></a><span class="p">)</span>
<span class="n">agg</span><span class="o">.</span><span class="n">draw</span><span class="p">()</span>
<span class="n">s</span> <span class="o">=</span> <span class="n">agg</span><span class="o">.</span><span class="n">tostring_rgb</span><span class="p">()</span>
<span class="c1"># get the width and the height to resize the matrix</span>
<span class="n">l</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">w</span><span class="p">,</span> <span class="n">h</span> <span class="o">=</span> <span class="n">agg</span><span class="o">.</span><span class="n">figure</span><span class="o">.</span><span class="n">bbox</span><span class="o">.</span><span class="n">bounds</span>
<span class="n">w</span><span class="p">,</span> <span class="n">h</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">w</span><span class="p">),</span> <span class="nb">int</span><span class="p">(</span><span class="n">h</span><span class="p">)</span>
<span class="n">X</span> <span class="o">=</span> <a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.fromstring.html#numpy.fromstring" title="View documentation for numpy.fromstring"><span class="n">np</span><span class="o">.</span><span class="n">fromstring</span></a><span class="p">(</span><span class="n">s</span><span class="p">,</span> <span class="n">np</span><span class="o">.</span><span class="n">uint8</span><span class="p">)</span><span class="o">.</span><span class="n">reshape</span><span class="p">((</span><span class="n">h</span><span class="p">,</span> <span class="n">w</span><span class="p">,</span> <span class="mi">3</span><span class="p">))</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">im</span> <span class="o">=</span> <span class="n">Image</span><span class="o">.</span><span class="n">fromstring</span><span class="p">(</span><span class="s2">"RGB"</span><span class="p">,</span> <span class="p">(</span><span class="n">w</span><span class="p">,</span> <span class="n">h</span><span class="p">),</span> <span class="n">s</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">Exception</span><span class="p">:</span>
<span class="n">im</span> <span class="o">=</span> <span class="n">Image</span><span class="o">.</span><span class="n">frombytes</span><span class="p">(</span><span class="s2">"RGB"</span><span class="p">,</span> <span class="p">(</span><span class="n">w</span><span class="p">,</span> <span class="n">h</span><span class="p">),</span> <span class="n">s</span><span class="p">)</span>
<span class="c1"># Uncomment this line to display the image using ImageMagick's</span>
<span class="c1"># `display` tool.</span>
<span class="c1"># im.show()</span>
</pre></div>
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