[vtkusers] Scale Image Values to [0,1]

[HansAusBremen]

Thanks for help so far.
But i got another question. As i wrote, i got a .raw-File, with 3 Dimensions
for a voxel-representation which i read in with vtkImageReader.

Is there a method or class to get the value of each voxel? Because i want to
use this value to calculate the avarage of all voxels. As i know this value
is only a gray value.
Can i get value from vtkImageReader or shall i use a mapper first?

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