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Berk Geveci authored
vtkImageGradient did not work in parallel because it assumed that the input extent is the same as the update extent, which is not the case when there are multiple pieces requested. This bug is prevalent among the imaging filters but for now I am fixing them one at a time. Fixing them all at once is non-trivial. Change-Id: I28bdd56e46c97ef7a80e18a46b6d266fbcd79134
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