[vtkusers] vtkAVIWriter with renderer gradient background shows distinct lines

[Santosh Biradar]

Thanks for the quick response Cory.
I tried setting quality to 0,1,2. The quality of the movie was best for 2
and worst for 0 but the background remained the same in each case.
The quality of the output of the  filter (in this case, a vtkContourFilter)
reduces with reduction in SetQuality but the background remains of the same
quality.
There is no difference in the quality of the background.

I also get the same behavior in Paraview's Save Animation feature (version
5.5 on windows)

Thanks,
Santosh


On Tue, Nov 27, 2018 at 7:29 PM Cory Quammen <cory.quammen at kitware.com>
wrote:

> Sounds like quantization/compression artifacts. You can try changing the
> quality setting to reduce compression via vtkAVIWriter::SetQuality().
>
> HTH,
> Cory
>
> On Tue, Nov 27, 2018 at 8:55 AM Santosh Biradar <scbiradar at gmail.com>
> wrote:
>
>> 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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>
> --
> Cory Quammen
> Staff R&D Engineer
> Kitware, Inc.
>
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