# GrapeCity.Documents.Imaging.GcBitmap.ConvertToPremultipliedAlpha

## Content

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<h1 id="GrapeCity_Documents_Imaging_GcBitmap_ConvertToPremultipliedAlpha_" data-uid="GrapeCity.Documents.Imaging.GcBitmap.ConvertToPremultipliedAlpha*">ConvertToPremultipliedAlpha Method
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<div class="markdown level0 summary"></div>
<div class="markdown level0 conceptual"></div>



<a id="GrapeCity_Documents_Imaging_GcBitmap_ConvertToPremultipliedAlpha_" data-uid="GrapeCity.Documents.Imaging.GcBitmap.ConvertToPremultipliedAlpha*"></a>
<h4 id="GrapeCity_Documents_Imaging_GcBitmap_ConvertToPremultipliedAlpha" data-uid="GrapeCity.Documents.Imaging.GcBitmap.ConvertToPremultipliedAlpha">ConvertToPremultipliedAlpha()</h4>
<div class="markdown level1 summary"><p>Premultiplies the color channels by the alpha channel and sets the <a class="xref" href="GrapeCity.Documents.Imaging.GcBitmap.Premultiplied.html#GrapeCity_Documents_Imaging_GcBitmap_Premultiplied">Premultiplied</a> property to True.</p>
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<div class="markdown level1 conceptual"></div>
<h5 class="declaration">Declaration</h5>
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  <pre><code class="lang-csharp hljs">public void ConvertToPremultipliedAlpha()</code></pre>
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  <pre><code class="lang-vbnet hljs">Public Sub ConvertToPremultipliedAlpha()</code></pre>
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<a id="GrapeCity_Documents_Imaging_GcBitmap_ConvertToPremultipliedAlpha_" data-uid="GrapeCity.Documents.Imaging.GcBitmap.ConvertToPremultipliedAlpha*"></a>
<h4 id="GrapeCity_Documents_Imaging_GcBitmap_ConvertToPremultipliedAlpha_System_Drawing_Rectangle_" data-uid="GrapeCity.Documents.Imaging.GcBitmap.ConvertToPremultipliedAlpha(System.Drawing.Rectangle)">ConvertToPremultipliedAlpha(Rectangle)</h4>
<div class="markdown level1 summary"><p>Premultiplies the color channels of the specified rectangle by the alpha channel.</p>
<p>
The <a class="xref" href="GrapeCity.Documents.Imaging.GcBitmap.Premultiplied.html#GrapeCity_Documents_Imaging_GcBitmap_Premultiplied">Premultiplied</a> property is not affected by this overload.
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<div class="markdown level1 conceptual"></div>
<h5 class="declaration">Declaration</h5>
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  <pre><code class="lang-csharp hljs">public void ConvertToPremultipliedAlpha(Rectangle clipRect)</code></pre>
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<div class="codewrapper">
  <pre><code class="lang-vbnet hljs">Public Sub ConvertToPremultipliedAlpha(clipRect As Rectangle)</code></pre>
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<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-condensed">
  <thead>
    <tr>
      <th>Type</th>
      <th>Name</th>
      <th>Description</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.drawing.rectangle">Rectangle</a></td>
      <td><span class="parametername">clipRect</span></td>
      <td><p>The target rectangle of the <a class="xref" href="GrapeCity.Documents.Imaging.GcBitmap.html">GcBitmap</a>.</p>
</td>
    </tr>
  </tbody>
</table>
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