package require vtk

# Image pipeline

vtkPNGReader reader
reader SetFileName "$VTK_DATA_ROOT/Data/fullhead15.png"

vtkImageClip clip
clip SetInputConnection [reader GetOutputPort]
clip SetOutputWholeExtent 80 230 80 230 0 0
clip ClipDataOff

vtkImageGradientMagnitude gradient
gradient SetDimensionality 2
gradient SetInputConnection [clip GetOutputPort]
gradient HandleBoundariesOff



vtkImageChangeInformation slide
slide SetInputConnection [gradient GetOutputPort]
slide SetExtentTranslation -100 -100 0

vtkImageViewer viewer
viewer SetInputConnection [slide GetOutputPort]
viewer SetColorWindow -1000
viewer SetColorLevel 500

viewer Render

source [file join [file dirname [info script]] WindowLevelInterface.tcl]