[Paraview] Python - Accessing Image Data

[Christian Werner]

Hi!

Is it actually possible to read and/or manipulate actual image data 
within the Python Shell? I can somehow access field and array data like 
this:

inputVolume=GetActiveSource()
pd=inputVolume.GetPointData
array=pd.GetArray(0)

Then I can do array.sort(), array.reverse() and such. But this has no 
noticable effect and isn't what I want anyway. I also tried GetFieldData 
and GetCellData, but their GetNumberOfArrays() returned 0.

This is just a general question. What I actually need is to read out 
which Points have been selected by the user.

Best regards,
Christian