[vtk-developers] Incorrect color function in vtkImageMapToWindowLevelColors with lookupTable

[xVict]

Hi David!

1. We want to show the medical image correctly
As a starting point, consider an example:
https://lorensen.github.io/VTKExamples/site/Cxx/IO/ReadDICOM/
We have next pipeline:
vtkDICOMImageReader->vtkImageViewer2
By mouse we can change windowLevel and windowWidth. 
ImageViewer2 internally transform 16bit input gray to output r=g=b color
into the render window.
Internally ImageViewer2 use vtkImageMapToWindowLevelColors for window-level.

2. I want use the same transformation but with LUT for 10-bit monitor.
Because I pass my LUT to this class. 
imgViewer->GetWindowLevel()->SetLookupTable(colorLut);
And for tests I using LUT with r=g=b.
If that's wrong, correct me. (Specify the correct example to display 16-bit
images on a 10-bit monitor).
But this does not exclude the incomprehensible code in the
vtkImageMapToWindowLevelColors class. Values less than 16 go to zero.

Victor



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