[vtkusers] vtkAVIWriter with renderer gradient background shows distinct lines

[Santosh Biradar]

I am trying to create a movie of an animation using vtkAVIWriter.
The renderer has a gradient background. The .avi file created has distinct
lines/bands in the background because of the gradient. Is it possible to
get rid of these lines. I notice that if I use a vtkBMPWriter and write an
image, the image seems fine without any such lines/bands.

A code snippet of what I am doing:

window_to_image = vtk.vtkWindowToImageFilter()
window_to_image.SetInput(renWin.GetRenderWindow())
window_to_image.SetInputBufferTypeToRGB()
window_to_image.ReadFrontBufferOff()

writer = vtk.vtkAVIWriter()
writer.SetInputConnection(window_to_image.GetOutputPort())

I am running python wrapper of VTK-6.3.0 on windows

Thanks,
Santosh
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