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

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<span id="misc-image-thumbnail"></span><h1>misc example code: image_thumbnail.py<a class="headerlink" href="#misc-example-code-image-thumbnail-py" title="Permalink to this headline">¶</a></h1>

<p>[<a class="reference external" href="image_thumbnail.py">source code</a>]</p>

<div class="highlight-default"><div class="highlight"><pre><span></span><span class="c1"># -*- noplot -*-</span>

<span class="sd">You can use matplotlib to generate thumbnails from existing images.</span>

<span class="sd">matplotlib natively supports PNG files on the input side, and other</span>

<span class="sd">image types transparently if your have PIL installed</span>

<span class="kn">from</span> <span class="nn">__future__</span> <span class="k">import</span> <span class="n">print_function</span>

<span class="c1"># build thumbnails of all images in a directory</span>

<span class="kn">import</span> <span class="nn">sys</span>

<span class="kn">import</span> <span class="nn">os</span>

<span class="kn">import</span> <span class="nn">glob</span>

<span class="kn">import</span> <span class="nn">matplotlib.image</span> <span class="k">as</span> <span class="nn">image</span>

<span class="nb">print</span><span class="p">(</span><span class="s1">'Usage: python </span><span class="si">%s</span><span class="s1"> IMAGEDIR'</span> <span class="o">%</span> <span class="vm">__file__</span><span class="p">)</span>

<span class="k">raise</span> <span class="ne">SystemExit</span>

<span class="n">indir</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">argv</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span>

<span class="k">if</span> <span class="ow">not</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isdir</span><span class="p">(</span><span class="n">indir</span><span class="p">):</span>

<span class="nb">print</span><span class="p">(</span><span class="s1">'Could not find input directory "</span><span class="si">%s</span><span class="s1">"'</span> <span class="o">%</span> <span class="n">indir</span><span class="p">)</span>

<span class="k">raise</span> <span class="ne">SystemExit</span>

<span class="n">outdir</span> <span class="o">=</span> <span class="s1">'thumbs'</span>

<span class="k">if</span> <span class="ow">not</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">exists</span><span class="p">(</span><span class="n">outdir</span><span class="p">):</span>

<span class="n">os</span><span class="o">.</span><span class="n">makedirs</span><span class="p">(</span><span class="n">outdir</span><span class="p">)</span>

<span class="k">for</span> <span class="n">fname</span> <span class="ow">in</span> <span class="n">glob</span><span class="o">.</span><span class="n">glob</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">indir</span><span class="p">,</span> <span class="s1">'*.png'</span><span class="p">)):</span>

<span class="n">basedir</span><span class="p">,</span> <span class="n">basename</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="n">fname</span><span class="p">)</span>

<span class="n">outfile</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">outdir</span><span class="p">,</span> <span class="n">basename</span><span class="p">)</span>

<span class="n">fig</span> <span class="o">=</span> <span class="n">image</span><span class="o">.</span><span class="n">thumbnail</span><span class="p">(</span><span class="n">fname</span><span class="p">,</span> <span class="n">outfile</span><span class="p">,</span> <span class="n">scale</span><span class="o">=</span><span class="mf">0.15</span><span class="p">)</span>

<span class="nb">print</span><span class="p">(</span><span class="s1">'saved thumbnail of </span><span class="si">%s</span><span class="s1"> to </span><span class="si">%s</span><span class="s1">'</span> <span class="o">%</span> <span class="p">(</span><span class="n">fname</span><span class="p">,</span> <span class="n">outfile</span><span class="p">))</span>

</pre></div>

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

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