[vtkusers] How to achieve the screen shot with VTK

[vinmean]

You can convert the image data into opencv Mat. Then you can save it in any
format.

cv::Mat screenshot()
{

	vtkSmartPointer<vtkWindowToImageFilter> wif =
vtkSmartPointer<vtkWindowToImageFilter>::New();
	wif->SetInput(renderWindow);
	wif->Update();
	vtkImageData* vtkRGBimage = wif->GetOutput();
	int dimsRGBImage[3];
	vtkRGBimage->GetDimensions(dimsRGBImage);
        cv::Mat cvImageRGB (dimsRGBImage[1], dimsRGBImage[0], CV_8UC3,
vtkRGBimage->GetScalarPointer());
        cv::cvtColor( cvImageRGB, cvImageRGB, CV_BGR2RGB); //convert color
        cv::flip( cvImageRGB, cvImageRGB, 0); //align axis with visualizer
	return cvImageRGB;
}



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