[vtkusers] Rescaling an image with a function f(x) = a*x+b and vtkImageShiftScale

[Jesús Spí­nola]

Hello,

my purpose is to scale an image in the form f(x) = a*x+b, where x is the
input pixel and a and b the parameters for rescaling. My question is if
vtkImageShiftscale class is the appropiate class to do that. In that case
which parameters correspond to a and b? Does a corresponds to scale and b to
shift?

Thanks!
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