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<h1>Source code for PIL.SgiImagePlugin</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"># SGI image file handling</span>
<span class="c1">#</span>
<span class="c1"># See "The SGI Image File Format (Draft version 0.97)", Paul Haeberli.</span>
<span class="c1"># <ftp://ftp.sgi.com/graphics/SGIIMAGESPEC></span>
<span class="c1">#</span>
<span class="c1">#</span>
<span class="c1"># History:</span>
<span class="c1"># 2017-22-07 mb Add RLE decompression</span>
<span class="c1"># 2016-16-10 mb Add save method without compression</span>
<span class="c1"># 1995-09-10 fl Created</span>
<span class="c1">#</span>
<span class="c1"># Copyright (c) 2016 by Mickael Bonfill.</span>
<span class="c1"># Copyright (c) 2008 by Karsten Hiddemann.</span>
<span class="c1"># Copyright (c) 1997 by Secret Labs AB.</span>
<span class="c1"># Copyright (c) 1995 by Fredrik Lundh.</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">.</span> <span class="k">import</span> <span class="n">Image</span><span class="p">,</span> <span class="n">ImageFile</span>
<span class="kn">from</span> <span class="nn">._binary</span> <span class="k">import</span> <span class="n">i8</span><span class="p">,</span> <span class="n">o8</span><span class="p">,</span> <span class="n">i16be</span> <span class="k">as</span> <span class="n">i16</span>
<span class="kn">from</span> <span class="nn">._util</span> <span class="k">import</span> <span class="n">py3</span>
<span class="kn">import</span> <span class="nn">struct</span>
<span class="kn">import</span> <span class="nn">os</span>
<span class="n">__version__</span> <span class="o">=</span> <span class="s2">"0.3"</span>
<span class="k">def</span> <span class="nf">_accept</span><span class="p">(</span><span class="n">prefix</span><span class="p">):</span>
<span class="k">return</span> <span class="nb">len</span><span class="p">(</span><span class="n">prefix</span><span class="p">)</span> <span class="o">>=</span> <span class="mi">2</span> <span class="ow">and</span> <span class="n">i16</span><span class="p">(</span><span class="n">prefix</span><span class="p">)</span> <span class="o">==</span> <span class="mi">474</span>
<span class="n">MODES</span> <span class="o">=</span> <span class="p">{</span>
<span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">):</span> <span class="s2">"L"</span><span class="p">,</span>
<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">1</span><span class="p">):</span> <span class="s2">"L"</span><span class="p">,</span>
<span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">):</span> <span class="s2">"L;16B"</span><span class="p">,</span>
<span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">1</span><span class="p">):</span> <span class="s2">"L;16B"</span><span class="p">,</span>
<span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">3</span><span class="p">):</span> <span class="s2">"RGB"</span><span class="p">,</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="mi">3</span><span class="p">):</span> <span class="s2">"RGB;16B"</span><span class="p">,</span>
<span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">):</span> <span class="s2">"RGBA"</span><span class="p">,</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="mi">4</span><span class="p">):</span> <span class="s2">"RGBA;16B"</span>
<span class="p">}</span>
<span class="c1">##</span>
<span class="c1"># Image plugin for SGI images.</span>
<div class="viewcode-block" id="SgiImageFile"><a class="viewcode-back" href="../../reference/plugins.html#PIL.SgiImagePlugin.SgiImageFile">[docs]</a><span class="k">class</span> <span class="nc">SgiImageFile</span><span class="p">(</span><span class="n">ImageFile</span><span class="o">.</span><span class="n">ImageFile</span><span class="p">):</span>
<span class="nb">format</span> <span class="o">=</span> <span class="s2">"SGI"</span>
<span class="n">format_description</span> <span class="o">=</span> <span class="s2">"SGI Image File Format"</span>
<span class="k">def</span> <span class="nf">_open</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># HEAD</span>
<span class="n">headlen</span> <span class="o">=</span> <span class="mi">512</span>
<span class="n">s</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">fp</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="n">headlen</span><span class="p">)</span>
<span class="c1"># magic number : 474</span>
<span class="k">if</span> <span class="n">i16</span><span class="p">(</span><span class="n">s</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">474</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s2">"Not an SGI image file"</span><span class="p">)</span>
<span class="c1"># compression : verbatim or RLE</span>
<span class="n">compression</span> <span class="o">=</span> <span class="n">i8</span><span class="p">(</span><span class="n">s</span><span class="p">[</span><span class="mi">2</span><span class="p">])</span>
<span class="c1"># bpc : 1 or 2 bytes (8bits or 16bits)</span>
<span class="n">bpc</span> <span class="o">=</span> <span class="n">i8</span><span class="p">(</span><span class="n">s</span><span class="p">[</span><span class="mi">3</span><span class="p">])</span>
<span class="c1"># dimension : 1, 2 or 3 (depending on xsize, ysize and zsize)</span>
<span class="n">dimension</span> <span class="o">=</span> <span class="n">i16</span><span class="p">(</span><span class="n">s</span><span class="p">[</span><span class="mi">4</span><span class="p">:])</span>
<span class="c1"># xsize : width</span>
<span class="n">xsize</span> <span class="o">=</span> <span class="n">i16</span><span class="p">(</span><span class="n">s</span><span class="p">[</span><span class="mi">6</span><span class="p">:])</span>
<span class="c1"># ysize : height</span>
<span class="n">ysize</span> <span class="o">=</span> <span class="n">i16</span><span class="p">(</span><span class="n">s</span><span class="p">[</span><span class="mi">8</span><span class="p">:])</span>
<span class="c1"># zsize : channels count</span>
<span class="n">zsize</span> <span class="o">=</span> <span class="n">i16</span><span class="p">(</span><span class="n">s</span><span class="p">[</span><span class="mi">10</span><span class="p">:])</span>
<span class="c1"># layout</span>
<span class="n">layout</span> <span class="o">=</span> <span class="n">bpc</span><span class="p">,</span> <span class="n">dimension</span><span class="p">,</span> <span class="n">zsize</span>
<span class="c1"># determine mode from bits/zsize</span>
<span class="n">rawmode</span> <span class="o">=</span> <span class="s2">""</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">rawmode</span> <span class="o">=</span> <span class="n">MODES</span><span class="p">[</span><span class="n">layout</span><span class="p">]</span>
<span class="k">except</span> <span class="ne">KeyError</span><span class="p">:</span>
<span class="k">pass</span>
<span class="k">if</span> <span class="n">rawmode</span> <span class="o">==</span> <span class="s2">""</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s2">"Unsupported SGI image mode"</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_size</span> <span class="o">=</span> <span class="n">xsize</span><span class="p">,</span> <span class="n">ysize</span>
<span class="bp">self</span><span class="o">.</span><span class="n">mode</span> <span class="o">=</span> <span class="n">rawmode</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s2">";"</span><span class="p">)[</span><span class="mi">0</span><span class="p">]</span>
<span class="c1"># orientation -1 : scanlines begins at the bottom-left corner</span>
<span class="n">orientation</span> <span class="o">=</span> <span class="o">-</span><span class="mi">1</span>
<span class="c1"># decoder info</span>
<span class="k">if</span> <span class="n">compression</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span>
<span class="n">pagesize</span> <span class="o">=</span> <span class="n">xsize</span> <span class="o">*</span> <span class="n">ysize</span> <span class="o">*</span> <span class="n">bpc</span>
<span class="k">if</span> <span class="n">bpc</span> <span class="o">==</span> <span class="mi">2</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">tile</span> <span class="o">=</span> <span class="p">[(</span><span class="s2">"SGI16"</span><span class="p">,</span> <span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span> <span class="o">+</span> <span class="bp">self</span><span class="o">.</span><span class="n">size</span><span class="p">,</span>
<span class="n">headlen</span><span class="p">,</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">mode</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="n">orientation</span><span class="p">))]</span>
<span class="k">else</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">tile</span> <span class="o">=</span> <span class="p">[]</span>
<span class="n">offset</span> <span class="o">=</span> <span class="n">headlen</span>
<span class="k">for</span> <span class="n">layer</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">mode</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">tile</span><span class="o">.</span><span class="n">append</span><span class="p">(</span>
<span class="p">(</span><span class="s2">"raw"</span><span class="p">,</span> <span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span> <span class="o">+</span> <span class="bp">self</span><span class="o">.</span><span class="n">size</span><span class="p">,</span>
<span class="n">offset</span><span class="p">,</span> <span class="p">(</span><span class="n">layer</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="n">orientation</span><span class="p">)))</span>
<span class="n">offset</span> <span class="o">+=</span> <span class="n">pagesize</span>
<span class="k">elif</span> <span class="n">compression</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">tile</span> <span class="o">=</span> <span class="p">[(</span><span class="s2">"sgi_rle"</span><span class="p">,</span> <span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span> <span class="o">+</span> <span class="bp">self</span><span class="o">.</span><span class="n">size</span><span class="p">,</span>
<span class="n">headlen</span><span class="p">,</span> <span class="p">(</span><span class="n">rawmode</span><span class="p">,</span> <span class="n">orientation</span><span class="p">,</span> <span class="n">bpc</span><span class="p">))]</span></div>
<span class="k">def</span> <span class="nf">_save</span><span class="p">(</span><span class="n">im</span><span class="p">,</span> <span class="n">fp</span><span class="p">,</span> <span class="n">filename</span><span class="p">):</span>
<span class="k">if</span> <span class="n">im</span><span class="o">.</span><span class="n">mode</span> <span class="o">!=</span> <span class="s2">"RGB"</span> <span class="ow">and</span> <span class="n">im</span><span class="o">.</span><span class="n">mode</span> <span class="o">!=</span> <span class="s2">"RGBA"</span> <span class="ow">and</span> <span class="n">im</span><span class="o">.</span><span class="n">mode</span> <span class="o">!=</span> <span class="s2">"L"</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s2">"Unsupported SGI image mode"</span><span class="p">)</span>
<span class="c1"># Get the keyword arguments</span>
<span class="n">info</span> <span class="o">=</span> <span class="n">im</span><span class="o">.</span><span class="n">encoderinfo</span>
<span class="c1"># Byte-per-pixel precision, 1 = 8bits per pixel</span>
<span class="n">bpc</span> <span class="o">=</span> <span class="n">info</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"bpc"</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
<span class="k">if</span> <span class="n">bpc</span> <span class="ow">not</span> <span class="ow">in</span> <span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">):</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s2">"Unsupported number of bytes per pixel"</span><span class="p">)</span>
<span class="c1"># Flip the image, since the origin of SGI file is the bottom-left corner</span>
<span class="n">orientation</span> <span class="o">=</span> <span class="o">-</span><span class="mi">1</span>
<span class="c1"># Define the file as SGI File Format</span>
<span class="n">magicNumber</span> <span class="o">=</span> <span class="mi">474</span>
<span class="c1"># Run-Length Encoding Compression - Unsupported at this time</span>
<span class="n">rle</span> <span class="o">=</span> <span class="mi">0</span>
<span class="c1"># Number of dimensions (x,y,z)</span>
<span class="n">dim</span> <span class="o">=</span> <span class="mi">3</span>
<span class="c1"># X Dimension = width / Y Dimension = height</span>
<span class="n">x</span><span class="p">,</span> <span class="n">y</span> <span class="o">=</span> <span class="n">im</span><span class="o">.</span><span class="n">size</span>
<span class="k">if</span> <span class="n">im</span><span class="o">.</span><span class="n">mode</span> <span class="o">==</span> <span class="s2">"L"</span> <span class="ow">and</span> <span class="n">y</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
<span class="n">dim</span> <span class="o">=</span> <span class="mi">1</span>
<span class="k">elif</span> <span class="n">im</span><span class="o">.</span><span class="n">mode</span> <span class="o">==</span> <span class="s2">"L"</span><span class="p">:</span>
<span class="n">dim</span> <span class="o">=</span> <span class="mi">2</span>
<span class="c1"># Z Dimension: Number of channels</span>
<span class="n">z</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="n">im</span><span class="o">.</span><span class="n">mode</span><span class="p">)</span>
<span class="k">if</span> <span class="n">dim</span> <span class="o">==</span> <span class="mi">1</span> <span class="ow">or</span> <span class="n">dim</span> <span class="o">==</span> <span class="mi">2</span><span class="p">:</span>
<span class="n">z</span> <span class="o">=</span> <span class="mi">1</span>
<span class="c1"># assert we've got the right number of bands.</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">im</span><span class="o">.</span><span class="n">getbands</span><span class="p">())</span> <span class="o">!=</span> <span class="n">z</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s2">"incorrect number of bands in SGI write: </span><span class="si">%s</span><span class="s2"> vs </span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span>
<span class="p">(</span><span class="n">z</span><span class="p">,</span> <span class="nb">len</span><span class="p">(</span><span class="n">im</span><span class="o">.</span><span class="n">getbands</span><span class="p">())))</span>
<span class="c1"># Minimum Byte value</span>
<span class="n">pinmin</span> <span class="o">=</span> <span class="mi">0</span>
<span class="c1"># Maximum Byte value (255 = 8bits per pixel)</span>
<span class="n">pinmax</span> <span class="o">=</span> <span class="mi">255</span>
<span class="c1"># Image name (79 characters max, truncated below in write)</span>
<span class="n">imgName</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">splitext</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">basename</span><span class="p">(</span><span class="n">filename</span><span class="p">))[</span><span class="mi">0</span><span class="p">]</span>
<span class="k">if</span> <span class="n">py3</span><span class="p">:</span>
<span class="n">imgName</span> <span class="o">=</span> <span class="n">imgName</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s1">'ascii'</span><span class="p">,</span> <span class="s1">'ignore'</span><span class="p">)</span>
<span class="c1"># Standard representation of pixel in the file</span>
<span class="n">colormap</span> <span class="o">=</span> <span class="mi">0</span>
<span class="n">fp</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">struct</span><span class="o">.</span><span class="n">pack</span><span class="p">(</span><span class="s1">'>h'</span><span class="p">,</span> <span class="n">magicNumber</span><span class="p">))</span>
<span class="n">fp</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">o8</span><span class="p">(</span><span class="n">rle</span><span class="p">))</span>
<span class="n">fp</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">o8</span><span class="p">(</span><span class="n">bpc</span><span class="p">))</span>
<span class="n">fp</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">struct</span><span class="o">.</span><span class="n">pack</span><span class="p">(</span><span class="s1">'>H'</span><span class="p">,</span> <span class="n">dim</span><span class="p">))</span>
<span class="n">fp</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">struct</span><span class="o">.</span><span class="n">pack</span><span class="p">(</span><span class="s1">'>H'</span><span class="p">,</span> <span class="n">x</span><span class="p">))</span>
<span class="n">fp</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">struct</span><span class="o">.</span><span class="n">pack</span><span class="p">(</span><span class="s1">'>H'</span><span class="p">,</span> <span class="n">y</span><span class="p">))</span>
<span class="n">fp</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">struct</span><span class="o">.</span><span class="n">pack</span><span class="p">(</span><span class="s1">'>H'</span><span class="p">,</span> <span class="n">z</span><span class="p">))</span>
<span class="n">fp</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">struct</span><span class="o">.</span><span class="n">pack</span><span class="p">(</span><span class="s1">'>l'</span><span class="p">,</span> <span class="n">pinmin</span><span class="p">))</span>
<span class="n">fp</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">struct</span><span class="o">.</span><span class="n">pack</span><span class="p">(</span><span class="s1">'>l'</span><span class="p">,</span> <span class="n">pinmax</span><span class="p">))</span>
<span class="n">fp</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">struct</span><span class="o">.</span><span class="n">pack</span><span class="p">(</span><span class="s1">'4s'</span><span class="p">,</span> <span class="sa">b</span><span class="s1">''</span><span class="p">))</span> <span class="c1"># dummy</span>
<span class="n">fp</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">struct</span><span class="o">.</span><span class="n">pack</span><span class="p">(</span><span class="s1">'79s'</span><span class="p">,</span> <span class="n">imgName</span><span class="p">))</span> <span class="c1"># truncates to 79 chars</span>
<span class="n">fp</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">struct</span><span class="o">.</span><span class="n">pack</span><span class="p">(</span><span class="s1">'s'</span><span class="p">,</span> <span class="sa">b</span><span class="s1">''</span><span class="p">))</span> <span class="c1"># force null byte after imgname</span>
<span class="n">fp</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">struct</span><span class="o">.</span><span class="n">pack</span><span class="p">(</span><span class="s1">'>l'</span><span class="p">,</span> <span class="n">colormap</span><span class="p">))</span>
<span class="n">fp</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">struct</span><span class="o">.</span><span class="n">pack</span><span class="p">(</span><span class="s1">'404s'</span><span class="p">,</span> <span class="sa">b</span><span class="s1">''</span><span class="p">))</span> <span class="c1"># dummy</span>
<span class="n">rawmode</span> <span class="o">=</span> <span class="s1">'L'</span>
<span class="k">if</span> <span class="n">bpc</span> <span class="o">==</span> <span class="mi">2</span><span class="p">:</span>
<span class="n">rawmode</span> <span class="o">=</span> <span class="s1">'L;16B'</span>
<span class="k">for</span> <span class="n">channel</span> <span class="ow">in</span> <span class="n">im</span><span class="o">.</span><span class="n">split</span><span class="p">():</span>
<span class="n">fp</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">channel</span><span class="o">.</span><span class="n">tobytes</span><span class="p">(</span><span class="s1">'raw'</span><span class="p">,</span> <span class="n">rawmode</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="n">orientation</span><span class="p">))</span>
<span class="n">fp</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
<div class="viewcode-block" id="SGI16Decoder"><a class="viewcode-back" href="../../reference/plugins.html#PIL.SgiImagePlugin.SGI16Decoder">[docs]</a><span class="k">class</span> <span class="nc">SGI16Decoder</span><span class="p">(</span><span class="n">ImageFile</span><span class="o">.</span><span class="n">PyDecoder</span><span class="p">):</span>
<span class="n">_pulls_fd</span> <span class="o">=</span> <span class="kc">True</span>
<div class="viewcode-block" id="SGI16Decoder.decode"><a class="viewcode-back" href="../../reference/plugins.html#PIL.SgiImagePlugin.SGI16Decoder.decode">[docs]</a> <span class="k">def</span> <span class="nf">decode</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">buffer</span><span class="p">):</span>
<span class="n">rawmode</span><span class="p">,</span> <span class="n">stride</span><span class="p">,</span> <span class="n">orientation</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">args</span>
<span class="n">pagesize</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">state</span><span class="o">.</span><span class="n">xsize</span> <span class="o">*</span> <span class="bp">self</span><span class="o">.</span><span class="n">state</span><span class="o">.</span><span class="n">ysize</span>
<span class="n">zsize</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">mode</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">fd</span><span class="o">.</span><span class="n">seek</span><span class="p">(</span><span class="mi">512</span><span class="p">)</span>
<span class="k">for</span> <span class="n">band</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="n">zsize</span><span class="p">):</span>
<span class="n">channel</span> <span class="o">=</span> <span class="n">Image</span><span class="o">.</span><span class="n">new</span><span class="p">(</span><span class="s1">'L'</span><span class="p">,</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">state</span><span class="o">.</span><span class="n">xsize</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">state</span><span class="o">.</span><span class="n">ysize</span><span class="p">))</span>
<span class="n">channel</span><span class="o">.</span><span class="n">frombytes</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">fd</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="mi">2</span> <span class="o">*</span> <span class="n">pagesize</span><span class="p">),</span> <span class="s1">'raw'</span><span class="p">,</span>
<span class="s1">'L;16B'</span><span class="p">,</span> <span class="n">stride</span><span class="p">,</span> <span class="n">orientation</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">im</span><span class="o">.</span><span class="n">putband</span><span class="p">(</span><span class="n">channel</span><span class="o">.</span><span class="n">im</span><span class="p">,</span> <span class="n">band</span><span class="p">)</span>
<span class="k">return</span> <span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="mi">0</span></div></div>
<span class="c1">#</span>
<span class="c1"># registry</span>
<span class="n">Image</span><span class="o">.</span><span class="n">register_decoder</span><span class="p">(</span><span class="s2">"SGI16"</span><span class="p">,</span> <span class="n">SGI16Decoder</span><span class="p">)</span>
<span class="n">Image</span><span class="o">.</span><span class="n">register_open</span><span class="p">(</span><span class="n">SgiImageFile</span><span class="o">.</span><span class="n">format</span><span class="p">,</span> <span class="n">SgiImageFile</span><span class="p">,</span> <span class="n">_accept</span><span class="p">)</span>
<span class="n">Image</span><span class="o">.</span><span class="n">register_save</span><span class="p">(</span><span class="n">SgiImageFile</span><span class="o">.</span><span class="n">format</span><span class="p">,</span> <span class="n">_save</span><span class="p">)</span>
<span class="n">Image</span><span class="o">.</span><span class="n">register_mime</span><span class="p">(</span><span class="n">SgiImageFile</span><span class="o">.</span><span class="n">format</span><span class="p">,</span> <span class="s2">"image/sgi"</span><span class="p">)</span>
<span class="n">Image</span><span class="o">.</span><span class="n">register_mime</span><span class="p">(</span><span class="n">SgiImageFile</span><span class="o">.</span><span class="n">format</span><span class="p">,</span> <span class="s2">"image/rgb"</span><span class="p">)</span>
<span class="n">Image</span><span class="o">.</span><span class="n">register_extensions</span><span class="p">(</span><span class="n">SgiImageFile</span><span class="o">.</span><span class="n">format</span><span class="p">,</span>
<span class="p">[</span><span class="s2">".bw"</span><span class="p">,</span> <span class="s2">".rgb"</span><span class="p">,</span> <span class="s2">".rgba"</span><span class="p">,</span> <span class="s2">".sgi"</span><span class="p">])</span>
<span class="c1"># End of file</span>
</pre></div>
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