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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

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<span id="pylab-examples-agg-buffer"></span><h1>pylab_examples example code: agg_buffer.py<a class="headerlink" href="#pylab-examples-example-code-agg-buffer-py" title="Permalink to this headline">¶</a></h1>

<p>(<a class="reference external" href="../../mpl_examples/pylab_examples/agg_buffer.py">Source code</a>, <a class="reference external" href="../../mpl_examples/pylab_examples/agg_buffer.png">png</a>, <a class="reference external" href="../../mpl_examples/pylab_examples/agg_buffer.hires.png">hires.png</a>, <a class="reference external" href="../../mpl_examples/pylab_examples/agg_buffer.pdf">pdf</a>)</p>

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<div class="highlight-python"><div class="highlight"><pre><span class="ch">#!/usr/bin/env python</span>

<span class="sd">Use backend agg to access the figure canvas as an RGB string and then</span>

<span class="sd">convert it to an array and pass it to Pillow for rendering.</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> <span class="n">FigureCanvasAgg</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>

<span class="n">canvas</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">get_current_fig_manager</span><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><span class="n">FigureCanvasAgg</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">X</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">fromstring</span><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="n">X</span><span class="o">.</span><span class="n">shape</span> <span class="o">=</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="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>

</pre></div>

</div>

<p>Keywords: python, matplotlib, pylab, example, codex (see <a class="reference internal" href="../../faq/howto_faq.html#how-to-search-examples"><span>Search examples</span></a>)</p>

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