[vtkusers] saving VTKRenderer as an Image

[swaroop]

Hi everyone,

	I have used vtkWindowToImageFilter to write contents of
	the displayed image to a file. This stores what we see in the window
	to an image.

	what is the best way to write the contents of VTKRenderer to an image
	without displaying it. I am trying to create an image of a contour plot
	without the borders so it can be displayed using a different application.

thanks in advance,
Swoop