# GrapeCity.Documents.Imaging.BitmapRenderer.UpdatedPixelMask

## Content

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<h1 id="GrapeCity_Documents_Imaging_BitmapRenderer_UpdatedPixelMask_" data-uid="GrapeCity.Documents.Imaging.BitmapRenderer.UpdatedPixelMask*">UpdatedPixelMask Property
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<a id="GrapeCity_Documents_Imaging_BitmapRenderer_UpdatedPixelMask_" data-uid="GrapeCity.Documents.Imaging.BitmapRenderer.UpdatedPixelMask*"></a>
<h4 id="GrapeCity_Documents_Imaging_BitmapRenderer_UpdatedPixelMask" data-uid="GrapeCity.Documents.Imaging.BitmapRenderer.UpdatedPixelMask">UpdatedPixelMask</h4>
<div class="markdown level1 summary"><p>Gets or sets a <a class="xref" href="GrapeCity.Documents.Imaging.BilevelBitmap.html">BilevelBitmap</a> that can be used to monitor changes in the target bitmap.
Its pixels are used as boolean flags indicating changes in the target.
When a pixel in the target bitmap is changed, the corresponding pixel in this bitmap
is set to 1 (true).
The <a class="xref" href="GrapeCity.Documents.Imaging.BilevelBitmap.html">BilevelBitmap</a> must have the same pixel size as the target bitmap.
It is user's responsibility to clear this bitmap (fill it with zeros) before any drawing on the target occurs.</p>
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<h5 class="declaration">Declaration</h5>
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  <pre><code class="lang-csharp hljs">public BilevelBitmap UpdatedPixelMask { get; set; }</code></pre>
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  <pre><code class="lang-vbnet hljs">Public Property UpdatedPixelMask As BilevelBitmap</code></pre>
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