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<li class="toctree-l4"><a class="reference internal" href="#std.Levels"><code class="docutils literal notranslate"><span class="pre">Levels()</span></code></a></li>
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<section id="levels">
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<h1>Levels<a class="headerlink" href="#levels" 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.Levels">
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<span class="sig-prename descclassname"><span class="pre">std.</span></span><span class="sig-name descname"><span class="pre">Levels</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="pre">vnode</span> <span class="pre">clip[,</span> <span class="pre">float</span> <span class="pre">min_in,</span> <span class="pre">float</span> <span class="pre">max_in,</span> <span class="pre">float</span> <span class="pre">gamma=1.0,</span> <span class="pre">float</span> <span class="pre">min_out,</span> <span class="pre">float</span> <span class="pre">max_out,</span> <span class="pre">int[]</span> <span class="pre">planes=[0,</span> <span class="pre">1,</span> <span class="pre">2]]</span></em><span class="sig-paren">)</span><a class="headerlink" href="#std.Levels" title="Permalink to this definition"></a></dt>
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<dd><p>Adjusts brightness, contrast, and gamma.</p>
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<p>The range [<em>min_in</em>, <em>max_in</em>] is remapped into [<em>min_out</em>, <em>max_out</em>]. Note that the
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range behavior is unintuitive for YUV float formats since the assumed range will be
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0-1 even for the UV-planes.</p>
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<p>For example, to convert from limited range YUV to full range (8 bit):</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">clip</span> <span class="o">=</span> <span class="n">std</span><span class="o">.</span><span class="n">Levels</span><span class="p">(</span><span class="n">clip</span><span class="p">,</span> <span class="n">min_in</span><span class="o">=</span><span class="mi">16</span><span class="p">,</span> <span class="n">max_in</span><span class="o">=</span><span class="mi">235</span><span class="p">,</span> <span class="n">min_out</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">max_out</span><span class="o">=</span><span class="mi">255</span><span class="p">,</span> <span class="n">planes</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span>
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<span class="n">clip</span> <span class="o">=</span> <span class="n">std</span><span class="o">.</span><span class="n">Levels</span><span class="p">(</span><span class="n">clip</span><span class="p">,</span> <span class="n">min_in</span><span class="o">=</span><span class="mi">16</span><span class="p">,</span> <span class="n">max_in</span><span class="o">=</span><span class="mi">240</span><span class="p">,</span> <span class="n">min_out</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">max_out</span><span class="o">=</span><span class="mi">255</span><span class="p">,</span> <span class="n">planes</span><span class="o">=</span><span class="p">[</span><span class="mi">1</span><span class="p">,</span><span class="mi">2</span><span class="p">])</span>
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</pre></div>
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</div>
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<p>The default value of <em>max_in</em> and <em>max_out</em> is the format’s minimum and maximum
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allowed values respectively. Note that all input is clamped to the input range
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to prevent out of range output.</p>
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<div class="admonition warning">
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<p class="admonition-title">Warning</p>
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<dl class="simple">
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<dt>The default ranges are 0-1 for floating point formats. This may have an undesired</dt><dd><p>effect on YUV formats.</p>
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</dd>
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</dl>
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<dl class="simple">
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<dt><em>clip</em></dt><dd><p>Clip to process. It must have integer sample type and bit depth
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between 8 and 16, or float sample type and bit depth of 32. If
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there are any frames with other formats, an error will be
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returned.</p>
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</dd>
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<dt><em>gamma</em></dt><dd><p>Controls the degree of non-linearity of the conversion. Values
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greater than 1.0 brighten the output, while values less than 1.0
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darken it.</p>
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</dd>
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<dt><em>planes</em></dt><dd><p>Specifies which planes will be processed. Any unprocessed planes
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will be simply copied.</p>
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</dd>
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