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# Divergence measures rate of change of gradient.
package require vtk
# Image pipeline
vtkPNGReader reader
reader SetFileName "$VTK_DATA_ROOT/Data/fullhead15.png"
vtkImageGradient gradient
gradient SetDimensionality 2
gradient SetInputConnection [reader GetOutputPort]
vtkImageDivergence derivative
derivative SetInputConnection [gradient GetOutputPort]
vtkImageViewer viewer
viewer SetInputConnection [derivative GetOutputPort]
viewer SetColorWindow 1000
viewer SetColorLevel 0
viewer Render
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