[vtkusers] saving the window to a file

[Bill Chivas]

I test it and it works as i had supposed.
I also add a note in wiki in screenshot example (a comment at line "windowToImageFilter->SetMagnification(3);").

http://www.cmake.org/Wiki/VTK/Examples/Cxx/Utilities/Screenshot

> Date: Tue, 12 Oct 2010 08:02:50 -0400
> From: daviddoria at gmail.com
> To: billno123 at hotmail.com
> CC: vtkusers at vtk.org
> Subject: Re: [vtkusers] saving the window to a file
> 
> On Tue, Oct 12, 2010 at 8:01 AM, Bill Chivas <billno123 at hotmail.com> wrote:
> > sorry, i meant
> > "For example i have a window 230x250, it goes to 690x750?"
> 
> I believe so, but I'm not sure. Please test it out and add a note
> describing the behavior to the wiki :)
> 
> David
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