How to change window/level programmatically

Development
1

Hi Andras, how could I set the window/level region programmatically, and apply the optimal window/level afterwards?

2

See example in script repository: https://www.slicer.org/wiki/Documentation/Nightly/ScriptRepository#Change_window.2Flevel_.28brightness.2Fcontrast.29_or_colormap_of_a_volume

3

Yes, I knew that example, but what I wanted is to auto window/level using a selected region, just like when we press ‘Ctrl’ and drag the mouse.

4

The logic is implemented in vtkImageHistogramStatistics. If you don’t want to use GUI then you can use that class directly from your scripts. You can have a look at the window/level widget’s source code as an example how it is used there.

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5

The code snippet for anyone that might be interested (selecting a rectangle at the specified positions on the background of the Green slice viewer and applying Window Level):

widget = slicer.vtkMRMLWindowLevelWidget()
widget.SetSliceNode(getNode('vtkMRMLSliceNodeGreen'))
widget.SetMRMLApplicationLogic(slicer.app.applicationLogic())
widget.UpdateWindowLevelFromRectangle(0, [60,60], [45,45])
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