[Paraview] Saving Programmable Filter as a PNG image

[Utkarsh Ayachit]

In vtkImageData, the scalars are associated with points, not cell. Add
the unsigned char array to the PointData, not CellData. Also note that
you'll need to update your whole extent, image dimensions etc. since
now you have 3x3 points and not 3x3 cells (==4x4 points).

Utkarsh

On Tue, Feb 4, 2014 at 11:08 AM, Magician <f_magician at mac.com> wrote:
> Hi all,
>
>
> I want to save vtkImageData as a PNG image.
> The vtkImageData is generated by Programmable Filter.
> My PV version is 4.1.0.
>
> I have a small CSV data as below:
>> 1,0.5,0
>> 0.5,1,0.5
>> 0,0.5,1
>
> I opened the data and applied the Programmable Filter as below:
>> #Output Data Set Type: vtkImageData
>> #Script:
>> inp = self.GetInput()
>> out = self.GetOutput()
>> out.SetDimensions(4, 4, 1)
>> out.SetOrigin(0, 0, 0)
>> out.SetSpacing(1, 1, 1)
>>
>> ca = vtk.vtkUnsignedCharArray()
>> ca.SetName('image')
>> ca.SetNumberOfComponents(3)
>> ca.SetNumberOfTuples(9)
>>
>> out.GetCellData().SetScalars(ca)
>> for i in range(3):
>>     for j in range(3):
>>         ca.SetTuple3(i * 3 + j, inp.GetValue(i, j).ToFloat() * 255.0, 0.0, 0.0)
>>
>> #RequestInformation Script:
>> from paraview import util
>>
>> inp = self.GetInput()
>> util.SetOutputWholeExtent(self, [0, 3, 0, 3, 0, 0])
>
> I got a 3x3 matrix image on the View.
> Then I saved the data as a PNG image, I got the warning and no image was found:
>> Warning: In /Users/kitware/Dashboards/MyTests/NightlyMaster/ParaViewSuperbuild-Release/paraview/src/paraview/VTK/IO/Image/vtkPNGWriter.cxx, line 198
>> vtkPNGWriter (0x11c80a540): PNGWriter only supports unsigned char and unsigned short inputs
>
> How can I save the Programmable Filter as an image?
>
>
> Magician
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