[vtkusers] Better contrast on image

[Manuel Corrales]

Hello, I need to get a better contrast from my image and improve the
contrast. Let say my viewer using gdcm show something like this:

http://tinypic.com/r/2rxxgzl/5

and I would like to see something like this:

http://tinypic.com/r/fz7v41/5

Any hints? I am new to vtk /itk and not sure if I should use ITK or VTK to
process this. Also I am opening the image using gdcm directly but not sure
if use ITK / VTK / GDCM or what to open the DICOM files.

Regards,
Manuel.
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