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<section id="lut2">
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<h1>Lut2<a class="headerlink" href="#lut2" title="Permalink to this heading"></a></h1>
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<dl class="py function">
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<dt class="sig sig-object py" id="std.Lut2">
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<span class="sig-prename descclassname"><span class="pre">std.</span></span><span class="sig-name descname"><span class="pre">Lut2</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">vnode</span> <span class="pre">clipa</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">vnode</span> <span class="pre">clipb</span></span></em><span class="optional">[</span>, <em class="sig-param"><span class="n"><span class="pre">int[]</span> <span class="pre">planes</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">int[]</span> <span class="pre">lut</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">float[]</span> <span class="pre">lutf</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">func</span> <span class="pre">function</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">int</span> <span class="pre">bits</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">bint</span> <span class="pre">floatout</span></span></em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#std.Lut2" title="Permalink to this definition"></a></dt>
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<dd><p>Applies a look-up table that takes into account the pixel values of two clips. The
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<em>lut</em> needs to contain 2^(clip1.bits_per_sample + clip2.bits_per_sample)
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entries and will be applied to the planes listed in <em>planes</em>. Alternatively
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a <em>function</em> taking <em>x</em> and <em>y</em> as arguments can be used to make the lut.
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The other planes will be passed through unchanged. By default all <em>planes</em>
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are processed.</p>
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<p>Lut2 also takes an optional bit depth parameter, <em>bits</em>, which defaults to
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the bit depth of the first input clip, and specifies the bit depth of the
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output clip. The user is responsible for understanding the effects of bit
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depth conversion, specifically from higher bit depths to lower bit depths,
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as no scaling or clamping is applied.</p>
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<p>If <em>floatout</em> is set then the output will be floating point instead, and either
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<em>lutf</em> needs to be set or <em>function</em> always needs to return floating point
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values.</p>
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<p>How to average 2 clips:</p>
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<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="n">lut</span> <span class="o">=</span> <span class="p">[]</span>
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<span class="k">for</span> <span class="n">y</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">2</span> <span class="o">**</span> <span class="n">clipy</span><span class="o">.</span><span class="n">format</span><span class="o">.</span><span class="n">bits_per_sample</span><span class="p">):</span>
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<span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">2</span> <span class="o">**</span> <span class="n">clipx</span><span class="o">.</span><span class="n">format</span><span class="o">.</span><span class="n">bits_per_sample</span><span class="p">):</span>
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<span class="n">lut</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">x</span> <span class="o">+</span> <span class="n">y</span><span class="p">)</span><span class="o">//</span><span class="mi">2</span><span class="p">)</span>
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<span class="n">Lut2</span><span class="p">(</span><span class="n">clipa</span><span class="o">=</span><span class="n">clipa</span><span class="p">,</span> <span class="n">clipb</span><span class="o">=</span><span class="n">clipb</span><span class="p">,</span> <span class="n">lut</span><span class="o">=</span><span class="n">lut</span><span class="p">)</span>
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</pre></div>
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</div>
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<p>How to average 2 clips with a 10-bit output:</p>
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<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">f</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">):</span>
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<span class="k">return</span> <span class="p">(</span><span class="n">x</span><span class="o">*</span><span class="mi">4</span> <span class="o">+</span> <span class="n">y</span><span class="p">)</span><span class="o">//</span><span class="mi">2</span>
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<span class="n">Lut2</span><span class="p">(</span><span class="n">clipa</span><span class="o">=</span><span class="n">clipa8bit</span><span class="p">,</span> <span class="n">clipb</span><span class="o">=</span><span class="n">clipb10bit</span><span class="p">,</span> <span class="n">function</span><span class="o">=</span><span class="n">f</span><span class="p">,</span> <span class="n">bits</span><span class="o">=</span><span class="mi">10</span><span class="p">)</span>
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</pre></div>
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</body>
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</html>
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