[vtkusers] Transparency in screenshot

[Dženan Zukić]

Hi all,

I have a problem with saving transparency from a screenshot into a file.

unsigned char
*pixDebug=vis->GetRenderWindow()->GetRGBACharPixelData(0,0,512,512,1);
//pixDebug contains alpha channel (determined by manual inspection of array
in debugger)

vtkWindowToImageFilter *windowGrabber=vtkWindowToImageFilter::New();
windowGrabber->SetInput(vis->GetRenderWindow()); //vis is a QVTK component

vtkPNGWriter *writer=vtkPNGWriter::New();
writer->SetInput(windowGrabber->GetOutput());
writer->SetFileName(filename.c_str());
writer->Write(); //file does not have alpha channel

Do you have any suggestions?

Thanks,
Dženan
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