[vtkusers] Image Difference of vtkImageData* type inputs

[Ashray Malhotra]

Hello,

I have a really basic question. I am trying to compute image difference of
2 images which I have in vtkImageData* format.

I tried searching a lot but the only way to use the vtkImageDifference
class that I could find is to give it at least one vtkAlgorithmOutput *
input.

Will I have to rewrite the entire imageDifference function or is there a
simpler way out?

Thanks a lot.

-- 
Regards
Ashray Malhotra
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