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copied!<p>If you are looking for a finished application, there is <a href="http://www.7capture.com/" rel="noreferrer">7capture</a>, which captures also the translucency, so images can be saved to PNG format for later compositing.</p> <p>EDIT:</p> <p>The original question and comments indicate you are looking to produce a region on Windows Vista/7 that you can then use to mask out parts the captured image, as is done with Windows XP and non-Aero UIs. Using a region is not going to give you the result you are looking for, since the window outline is not computed as a region, but as an image with variable transparency - RGBA. The Alpha channel in that image is your mask, but it's not an on-off mask like a region, but a gradual mask with a range of values from pixels being fully included to being fully masked out. </p> <p>Although it uses undocumented APIs, the code at <a href="http://spazzarama.wordpress.com/2009/02/12/screen-capture-with-vista-dwm/" rel="noreferrer">http://spazzarama.wordpress.com/2009/02/12/screen-capture-with-vista-dwm/</a> will capture to a RGBA buffer which you can then use to render or save the image with the shadow and other translucency effects intact.</p> <p>In <code>DwmCapture.cs</code> Change</p> <pre><code>BackBufferFormat = Format.X8R8G8B8 </code></pre> <p>to</p> <pre><code>BackBufferFormat = Format.A8R8G8B8 </code></pre> <p>(X8->A8)</p> <p>And you should then be able to access both the usual RGB data plus transparency from the captured buffer. This can then be saved as a PNG or other format with alpha-channel for composing.</p>

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