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<h1>Source code for PIL.ImageShow</h1><div class="highlight"><pre>
<span></span><span class="c1">#</span>
<span class="c1"># The Python Imaging Library.</span>
<span class="c1"># $Id$</span>
<span class="c1">#</span>
<span class="c1"># im.show() drivers</span>
<span class="c1">#</span>
<span class="c1"># History:</span>
<span class="c1"># 2008-04-06 fl Created</span>
<span class="c1">#</span>
<span class="c1"># Copyright (c) Secret Labs AB 2008.</span>
<span class="c1">#</span>
<span class="c1"># See the README file for information on usage and redistribution.</span>
<span class="c1">#</span>
<span class="kn">from</span> <span class="nn">__future__</span> <span class="k">import</span> <span class="n">print_function</span>
<span class="kn">from</span> <span class="nn">PIL</span> <span class="k">import</span> <span class="n">Image</span>
<span class="kn">import</span> <span class="nn">os</span>
<span class="kn">import</span> <span class="nn">sys</span>
<span class="kn">import</span> <span class="nn">subprocess</span>
<span class="kn">import</span> <span class="nn">tempfile</span>
<span class="k">if</span> <span class="n">sys</span><span class="o">.</span><span class="n">version_info</span><span class="o">.</span><span class="n">major</span> <span class="o">>=</span> <span class="mi">3</span><span class="p">:</span>
<span class="kn">from</span> <span class="nn">shlex</span> <span class="k">import</span> <span class="n">quote</span>
<span class="k">else</span><span class="p">:</span>
<span class="kn">from</span> <span class="nn">pipes</span> <span class="k">import</span> <span class="n">quote</span>
<span class="n">_viewers</span> <span class="o">=</span> <span class="p">[]</span>
<div class="viewcode-block" id="register"><a class="viewcode-back" href="../../PIL.html#PIL.ImageShow.register">[docs]</a><span class="k">def</span> <span class="nf">register</span><span class="p">(</span><span class="n">viewer</span><span class="p">,</span> <span class="n">order</span><span class="o">=</span><span class="mi">1</span><span class="p">):</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">if</span> <span class="nb">issubclass</span><span class="p">(</span><span class="n">viewer</span><span class="p">,</span> <span class="n">Viewer</span><span class="p">):</span>
<span class="n">viewer</span> <span class="o">=</span> <span class="n">viewer</span><span class="p">()</span>
<span class="k">except</span> <span class="ne">TypeError</span><span class="p">:</span>
<span class="k">pass</span> <span class="c1"># raised if viewer wasn't a class</span>
<span class="k">if</span> <span class="n">order</span> <span class="o">></span> <span class="mi">0</span><span class="p">:</span>
<span class="n">_viewers</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">viewer</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">order</span> <span class="o"><</span> <span class="mi">0</span><span class="p">:</span>
<span class="n">_viewers</span><span class="o">.</span><span class="n">insert</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="n">viewer</span><span class="p">)</span></div>
<div class="viewcode-block" id="show"><a class="viewcode-back" href="../../PIL.html#PIL.ImageShow.show">[docs]</a><span class="k">def</span> <span class="nf">show</span><span class="p">(</span><span class="n">image</span><span class="p">,</span> <span class="n">title</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="o">**</span><span class="n">options</span><span class="p">):</span>
<span class="sa">r</span><span class="sd">"""</span>
<span class="sd"> Display a given image.</span>
<span class="sd"> :param image: An image object.</span>
<span class="sd"> :param title: Optional title. Not all viewers can display the title.</span>
<span class="sd"> :param \**options: Additional viewer options.</span>
<span class="sd"> :returns: True if a suitable viewer was found, false otherwise.</span>
<span class="sd"> """</span>
<span class="k">for</span> <span class="n">viewer</span> <span class="ow">in</span> <span class="n">_viewers</span><span class="p">:</span>
<span class="k">if</span> <span class="n">viewer</span><span class="o">.</span><span class="n">show</span><span class="p">(</span><span class="n">image</span><span class="p">,</span> <span class="n">title</span><span class="o">=</span><span class="n">title</span><span class="p">,</span> <span class="o">**</span><span class="n">options</span><span class="p">):</span>
<span class="k">return</span> <span class="mi">1</span>
<span class="k">return</span> <span class="mi">0</span></div>
<div class="viewcode-block" id="Viewer"><a class="viewcode-back" href="../../PIL.html#PIL.ImageShow.Viewer">[docs]</a><span class="k">class</span> <span class="nc">Viewer</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">"""Base class for viewers."""</span>
<span class="c1"># main api</span>
<div class="viewcode-block" id="Viewer.show"><a class="viewcode-back" href="../../PIL.html#PIL.ImageShow.Viewer.show">[docs]</a> <span class="k">def</span> <span class="nf">show</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">image</span><span class="p">,</span> <span class="o">**</span><span class="n">options</span><span class="p">):</span>
<span class="c1"># save temporary image to disk</span>
<span class="k">if</span> <span class="n">image</span><span class="o">.</span><span class="n">mode</span><span class="p">[:</span><span class="mi">4</span><span class="p">]</span> <span class="o">==</span> <span class="s2">"I;16"</span><span class="p">:</span>
<span class="c1"># @PIL88 @PIL101</span>
<span class="c1"># "I;16" isn't an 'official' mode, but we still want to</span>
<span class="c1"># provide a simple way to show 16-bit images.</span>
<span class="n">base</span> <span class="o">=</span> <span class="s2">"L"</span>
<span class="c1"># FIXME: auto-contrast if max() > 255?</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">base</span> <span class="o">=</span> <span class="n">Image</span><span class="o">.</span><span class="n">getmodebase</span><span class="p">(</span><span class="n">image</span><span class="o">.</span><span class="n">mode</span><span class="p">)</span>
<span class="k">if</span> <span class="n">base</span> <span class="o">!=</span> <span class="n">image</span><span class="o">.</span><span class="n">mode</span> <span class="ow">and</span> <span class="n">image</span><span class="o">.</span><span class="n">mode</span> <span class="o">!=</span> <span class="s2">"1"</span> <span class="ow">and</span> <span class="n">image</span><span class="o">.</span><span class="n">mode</span> <span class="o">!=</span> <span class="s2">"RGBA"</span><span class="p">:</span>
<span class="n">image</span> <span class="o">=</span> <span class="n">image</span><span class="o">.</span><span class="n">convert</span><span class="p">(</span><span class="n">base</span><span class="p">)</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">show_image</span><span class="p">(</span><span class="n">image</span><span class="p">,</span> <span class="o">**</span><span class="n">options</span><span class="p">)</span></div>
<span class="c1"># hook methods</span>
<span class="nb">format</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">options</span> <span class="o">=</span> <span class="p">{}</span>
<div class="viewcode-block" id="Viewer.get_format"><a class="viewcode-back" href="../../PIL.html#PIL.ImageShow.Viewer.get_format">[docs]</a> <span class="k">def</span> <span class="nf">get_format</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">image</span><span class="p">):</span>
<span class="sd">"""Return format name, or None to save as PGM/PPM"""</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">format</span></div>
<div class="viewcode-block" id="Viewer.get_command"><a class="viewcode-back" href="../../PIL.html#PIL.ImageShow.Viewer.get_command">[docs]</a> <span class="k">def</span> <span class="nf">get_command</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">file</span><span class="p">,</span> <span class="o">**</span><span class="n">options</span><span class="p">):</span>
<span class="k">raise</span> <span class="ne">NotImplementedError</span></div>
<div class="viewcode-block" id="Viewer.save_image"><a class="viewcode-back" href="../../PIL.html#PIL.ImageShow.Viewer.save_image">[docs]</a> <span class="k">def</span> <span class="nf">save_image</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">image</span><span class="p">):</span>
<span class="sd">"""Save to temporary file, and return filename"""</span>
<span class="k">return</span> <span class="n">image</span><span class="o">.</span><span class="n">_dump</span><span class="p">(</span><span class="nb">format</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">get_format</span><span class="p">(</span><span class="n">image</span><span class="p">),</span> <span class="o">**</span><span class="bp">self</span><span class="o">.</span><span class="n">options</span><span class="p">)</span></div>
<div class="viewcode-block" id="Viewer.show_image"><a class="viewcode-back" href="../../PIL.html#PIL.ImageShow.Viewer.show_image">[docs]</a> <span class="k">def</span> <span class="nf">show_image</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">image</span><span class="p">,</span> <span class="o">**</span><span class="n">options</span><span class="p">):</span>
<span class="sd">"""Display given image"""</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">show_file</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">save_image</span><span class="p">(</span><span class="n">image</span><span class="p">),</span> <span class="o">**</span><span class="n">options</span><span class="p">)</span></div>
<div class="viewcode-block" id="Viewer.show_file"><a class="viewcode-back" href="../../PIL.html#PIL.ImageShow.Viewer.show_file">[docs]</a> <span class="k">def</span> <span class="nf">show_file</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">file</span><span class="p">,</span> <span class="o">**</span><span class="n">options</span><span class="p">):</span>
<span class="sd">"""Display given file"""</span>
<span class="n">os</span><span class="o">.</span><span class="n">system</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">get_command</span><span class="p">(</span><span class="n">file</span><span class="p">,</span> <span class="o">**</span><span class="n">options</span><span class="p">))</span>
<span class="k">return</span> <span class="mi">1</span></div></div>
<span class="c1"># --------------------------------------------------------------------</span>
<span class="k">if</span> <span class="n">sys</span><span class="o">.</span><span class="n">platform</span> <span class="o">==</span> <span class="s2">"win32"</span><span class="p">:</span>
<span class="k">class</span> <span class="nc">WindowsViewer</span><span class="p">(</span><span class="n">Viewer</span><span class="p">):</span>
<span class="nb">format</span> <span class="o">=</span> <span class="s2">"BMP"</span>
<span class="k">def</span> <span class="nf">get_command</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">file</span><span class="p">,</span> <span class="o">**</span><span class="n">options</span><span class="p">):</span>
<span class="k">return</span> <span class="p">(</span><span class="s1">'start "Pillow" /WAIT "</span><span class="si">%s</span><span class="s1">" '</span>
<span class="s1">'&& ping -n 2 127.0.0.1 >NUL '</span>
<span class="s1">'&& del /f "</span><span class="si">%s</span><span class="s1">"'</span> <span class="o">%</span> <span class="p">(</span><span class="n">file</span><span class="p">,</span> <span class="n">file</span><span class="p">))</span>
<span class="n">register</span><span class="p">(</span><span class="n">WindowsViewer</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">sys</span><span class="o">.</span><span class="n">platform</span> <span class="o">==</span> <span class="s2">"darwin"</span><span class="p">:</span>
<span class="k">class</span> <span class="nc">MacViewer</span><span class="p">(</span><span class="n">Viewer</span><span class="p">):</span>
<span class="nb">format</span> <span class="o">=</span> <span class="s2">"PNG"</span>
<span class="n">options</span> <span class="o">=</span> <span class="p">{</span><span class="s1">'compress_level'</span><span class="p">:</span> <span class="mi">1</span><span class="p">}</span>
<span class="k">def</span> <span class="nf">get_command</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">file</span><span class="p">,</span> <span class="o">**</span><span class="n">options</span><span class="p">):</span>
<span class="c1"># on darwin open returns immediately resulting in the temp</span>
<span class="c1"># file removal while app is opening</span>
<span class="n">command</span> <span class="o">=</span> <span class="s2">"open -a /Applications/Preview.app"</span>
<span class="n">command</span> <span class="o">=</span> <span class="s2">"(</span><span class="si">%s</span><span class="s2"> </span><span class="si">%s</span><span class="s2">; sleep 20; rm -f </span><span class="si">%s</span><span class="s2">)&"</span> <span class="o">%</span> <span class="p">(</span><span class="n">command</span><span class="p">,</span> <span class="n">quote</span><span class="p">(</span><span class="n">file</span><span class="p">),</span>
<span class="n">quote</span><span class="p">(</span><span class="n">file</span><span class="p">))</span>
<span class="k">return</span> <span class="n">command</span>
<span class="k">def</span> <span class="nf">show_file</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">file</span><span class="p">,</span> <span class="o">**</span><span class="n">options</span><span class="p">):</span>
<span class="sd">"""Display given file"""</span>
<span class="n">fd</span><span class="p">,</span> <span class="n">path</span> <span class="o">=</span> <span class="n">tempfile</span><span class="o">.</span><span class="n">mkstemp</span><span class="p">()</span>
<span class="k">with</span> <span class="n">os</span><span class="o">.</span><span class="n">fdopen</span><span class="p">(</span><span class="n">fd</span><span class="p">,</span> <span class="s1">'w'</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
<span class="n">f</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">file</span><span class="p">)</span>
<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="s2">"r"</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
<span class="n">subprocess</span><span class="o">.</span><span class="n">Popen</span><span class="p">([</span>
<span class="s1">'im=$(cat);'</span>
<span class="s1">'open -a /Applications/Preview.app $im;'</span>
<span class="s1">'sleep 20;'</span>
<span class="s1">'rm -f $im'</span>
<span class="p">],</span> <span class="n">shell</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">stdin</span><span class="o">=</span><span class="n">f</span><span class="p">)</span>
<span class="n">os</span><span class="o">.</span><span class="n">remove</span><span class="p">(</span><span class="n">path</span><span class="p">)</span>
<span class="k">return</span> <span class="mi">1</span>
<span class="n">register</span><span class="p">(</span><span class="n">MacViewer</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="c1"># unixoids</span>
<div class="viewcode-block" id="which"><a class="viewcode-back" href="../../PIL.html#PIL.ImageShow.which">[docs]</a> <span class="k">def</span> <span class="nf">which</span><span class="p">(</span><span class="n">executable</span><span class="p">):</span>
<span class="n">path</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"PATH"</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">path</span><span class="p">:</span>
<span class="k">return</span> <span class="kc">None</span>
<span class="k">for</span> <span class="n">dirname</span> <span class="ow">in</span> <span class="n">path</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">pathsep</span><span class="p">):</span>
<span class="n">filename</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">dirname</span><span class="p">,</span> <span class="n">executable</span><span class="p">)</span>
<span class="k">if</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isfile</span><span class="p">(</span><span class="n">filename</span><span class="p">)</span> <span class="ow">and</span> <span class="n">os</span><span class="o">.</span><span class="n">access</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="n">os</span><span class="o">.</span><span class="n">X_OK</span><span class="p">):</span>
<span class="k">return</span> <span class="n">filename</span>
<span class="k">return</span> <span class="kc">None</span></div>
<div class="viewcode-block" id="UnixViewer"><a class="viewcode-back" href="../../PIL.html#PIL.ImageShow.UnixViewer">[docs]</a> <span class="k">class</span> <span class="nc">UnixViewer</span><span class="p">(</span><span class="n">Viewer</span><span class="p">):</span>
<span class="nb">format</span> <span class="o">=</span> <span class="s2">"PNG"</span>
<span class="n">options</span> <span class="o">=</span> <span class="p">{</span><span class="s1">'compress_level'</span><span class="p">:</span> <span class="mi">1</span><span class="p">}</span>
<div class="viewcode-block" id="UnixViewer.get_command"><a class="viewcode-back" href="../../PIL.html#PIL.ImageShow.UnixViewer.get_command">[docs]</a> <span class="k">def</span> <span class="nf">get_command</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">file</span><span class="p">,</span> <span class="o">**</span><span class="n">options</span><span class="p">):</span>
<span class="n">command</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_command_ex</span><span class="p">(</span><span class="n">file</span><span class="p">,</span> <span class="o">**</span><span class="n">options</span><span class="p">)[</span><span class="mi">0</span><span class="p">]</span>
<span class="k">return</span> <span class="s2">"(</span><span class="si">%s</span><span class="s2"> </span><span class="si">%s</span><span class="s2">; rm -f </span><span class="si">%s</span><span class="s2">)&"</span> <span class="o">%</span> <span class="p">(</span><span class="n">command</span><span class="p">,</span> <span class="n">quote</span><span class="p">(</span><span class="n">file</span><span class="p">),</span> <span class="n">quote</span><span class="p">(</span><span class="n">file</span><span class="p">))</span></div>
<div class="viewcode-block" id="UnixViewer.show_file"><a class="viewcode-back" href="../../PIL.html#PIL.ImageShow.UnixViewer.show_file">[docs]</a> <span class="k">def</span> <span class="nf">show_file</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">file</span><span class="p">,</span> <span class="o">**</span><span class="n">options</span><span class="p">):</span>
<span class="sd">"""Display given file"""</span>
<span class="n">fd</span><span class="p">,</span> <span class="n">path</span> <span class="o">=</span> <span class="n">tempfile</span><span class="o">.</span><span class="n">mkstemp</span><span class="p">()</span>
<span class="k">with</span> <span class="n">os</span><span class="o">.</span><span class="n">fdopen</span><span class="p">(</span><span class="n">fd</span><span class="p">,</span> <span class="s1">'w'</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
<span class="n">f</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">file</span><span class="p">)</span>
<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="s2">"r"</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
<span class="n">command</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_command_ex</span><span class="p">(</span><span class="n">file</span><span class="p">,</span> <span class="o">**</span><span class="n">options</span><span class="p">)[</span><span class="mi">0</span><span class="p">]</span>
<span class="n">subprocess</span><span class="o">.</span><span class="n">Popen</span><span class="p">([</span>
<span class="s1">'im=$(cat);'</span> <span class="o">+</span>
<span class="n">command</span><span class="o">+</span><span class="s1">' $im;'</span>
<span class="s1">'rm -f $im'</span>
<span class="p">],</span> <span class="n">shell</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">stdin</span><span class="o">=</span><span class="n">f</span><span class="p">)</span>
<span class="n">os</span><span class="o">.</span><span class="n">remove</span><span class="p">(</span><span class="n">path</span><span class="p">)</span>
<span class="k">return</span> <span class="mi">1</span></div></div>
<span class="c1"># implementations</span>
<div class="viewcode-block" id="DisplayViewer"><a class="viewcode-back" href="../../PIL.html#PIL.ImageShow.DisplayViewer">[docs]</a> <span class="k">class</span> <span class="nc">DisplayViewer</span><span class="p">(</span><span class="n">UnixViewer</span><span class="p">):</span>
<div class="viewcode-block" id="DisplayViewer.get_command_ex"><a class="viewcode-back" href="../../PIL.html#PIL.ImageShow.DisplayViewer.get_command_ex">[docs]</a> <span class="k">def</span> <span class="nf">get_command_ex</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">file</span><span class="p">,</span> <span class="o">**</span><span class="n">options</span><span class="p">):</span>
<span class="n">command</span> <span class="o">=</span> <span class="n">executable</span> <span class="o">=</span> <span class="s2">"display"</span>
<span class="k">return</span> <span class="n">command</span><span class="p">,</span> <span class="n">executable</span></div></div>
<span class="k">if</span> <span class="n">which</span><span class="p">(</span><span class="s2">"display"</span><span class="p">):</span>
<span class="n">register</span><span class="p">(</span><span class="n">DisplayViewer</span><span class="p">)</span>
<div class="viewcode-block" id="EogViewer"><a class="viewcode-back" href="../../PIL.html#PIL.ImageShow.EogViewer">[docs]</a> <span class="k">class</span> <span class="nc">EogViewer</span><span class="p">(</span><span class="n">UnixViewer</span><span class="p">):</span>
<div class="viewcode-block" id="EogViewer.get_command_ex"><a class="viewcode-back" href="../../PIL.html#PIL.ImageShow.EogViewer.get_command_ex">[docs]</a> <span class="k">def</span> <span class="nf">get_command_ex</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">file</span><span class="p">,</span> <span class="o">**</span><span class="n">options</span><span class="p">):</span>
<span class="n">command</span> <span class="o">=</span> <span class="n">executable</span> <span class="o">=</span> <span class="s2">"eog"</span>
<span class="k">return</span> <span class="n">command</span><span class="p">,</span> <span class="n">executable</span></div></div>
<span class="k">if</span> <span class="n">which</span><span class="p">(</span><span class="s2">"eog"</span><span class="p">):</span>
<span class="n">register</span><span class="p">(</span><span class="n">EogViewer</span><span class="p">)</span>
<div class="viewcode-block" id="XVViewer"><a class="viewcode-back" href="../../PIL.html#PIL.ImageShow.XVViewer">[docs]</a> <span class="k">class</span> <span class="nc">XVViewer</span><span class="p">(</span><span class="n">UnixViewer</span><span class="p">):</span>
<div class="viewcode-block" id="XVViewer.get_command_ex"><a class="viewcode-back" href="../../PIL.html#PIL.ImageShow.XVViewer.get_command_ex">[docs]</a> <span class="k">def</span> <span class="nf">get_command_ex</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">file</span><span class="p">,</span> <span class="n">title</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="o">**</span><span class="n">options</span><span class="p">):</span>
<span class="c1"># note: xv is pretty outdated. most modern systems have</span>
<span class="c1"># imagemagick's display command instead.</span>
<span class="n">command</span> <span class="o">=</span> <span class="n">executable</span> <span class="o">=</span> <span class="s2">"xv"</span>
<span class="k">if</span> <span class="n">title</span><span class="p">:</span>
<span class="n">command</span> <span class="o">+=</span> <span class="s2">" -name </span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="n">quote</span><span class="p">(</span><span class="n">title</span><span class="p">)</span>
<span class="k">return</span> <span class="n">command</span><span class="p">,</span> <span class="n">executable</span></div></div>
<span class="k">if</span> <span class="n">which</span><span class="p">(</span><span class="s2">"xv"</span><span class="p">):</span>
<span class="n">register</span><span class="p">(</span><span class="n">XVViewer</span><span class="p">)</span>
<span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s2">"__main__"</span><span class="p">:</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">sys</span><span class="o">.</span><span class="n">argv</span><span class="p">)</span> <span class="o"><</span> <span class="mi">2</span><span class="p">:</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"Syntax: python ImageShow.py imagefile [title]"</span><span class="p">)</span>
<span class="n">sys</span><span class="o">.</span><span class="n">exit</span><span class="p">()</span>
<span class="nb">print</span><span class="p">(</span><span class="n">show</span><span class="p">(</span><span class="n">Image</span><span class="o">.</span><span class="n">open</span><span class="p">(</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="o">*</span><span class="n">sys</span><span class="o">.</span><span class="n">argv</span><span class="p">[</span><span class="mi">2</span><span class="p">:]))</span>
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