# GrapeCity.Documents.Imaging.GcBitmap.SetAlphaTo255

## Content

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<h1 id="GrapeCity_Documents_Imaging_GcBitmap_SetAlphaTo255_" data-uid="GrapeCity.Documents.Imaging.GcBitmap.SetAlphaTo255*">SetAlphaTo255 Method
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<div class="markdown level0 summary"></div>
<div class="markdown level0 conceptual"></div>



<a id="GrapeCity_Documents_Imaging_GcBitmap_SetAlphaTo255_" data-uid="GrapeCity.Documents.Imaging.GcBitmap.SetAlphaTo255*"></a>
<h4 id="GrapeCity_Documents_Imaging_GcBitmap_SetAlphaTo255_System_Nullable_System_Drawing_Rectangle__" data-uid="GrapeCity.Documents.Imaging.GcBitmap.SetAlphaTo255(System.Nullable{System.Drawing.Rectangle})">SetAlphaTo255(Rectangle?)</h4>
<div class="markdown level1 summary"><p>Updates the alpha channel of pixels to 255 (to make them opaque).</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 SetAlphaTo255(Rectangle? clipRect = null)</code></pre>
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  <pre><code class="lang-vbnet hljs">Public Sub SetAlphaTo255(Optional clipRect As Rectangle? = Nothing)</code></pre>
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<h5 class="parameters">Parameters</h5>
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      <th>Type</th>
      <th>Name</th>
      <th>Description</th>
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    <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>
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    </tr>
  </tbody>
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