[vtkusers] textures color levels adjustment in vtk - like Photoshop

[Michele Zamponi]

Hi all,
 
As you can see I'm not a vtk guru!
 
I need to adjust color levels (such RGB channels, Brightness, Contrast,
etc) of textures applied over some vtkActors. In other words, I need to
implement the "Photoshop Adjust Levels" over a texturized vtkActor.
 
Is it possible? And, if yes, how can I do it?
 
Thank you in advance for any help.
Michele
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