[vtkusers] how do I traverse the scalars of a vtkImageData?

[Mathieu Malaterre]

Nico,

	imagedata->Update(); //important
	float minmax[2] = imagedata->GetScalarRange();

	vtkImageShiftScale::SetShift(-minmax[0]);
	vtkImageShiftScale::SetScale(255./(minmax[1]-minmax[0]));
	vtkImageShiftScale::SetOutputScalarTypeToUnsignedChar ()

See:
http://www.vtk.org/doc/nightly/html/classvtkImageShiftScale.html


HTH
mathieu

Nico Vermaas wrote:
> Hi,
> 
> To make volume rendering possible I want to convert the scalars in an vtkImageData to unsigned chars. I need to change them and make them range from 0 - 255.
>   
> I used to use SetScalar, but that doesn't seem to work any longer in VTK4. So what is the best way to traverse the scalar values in a vtkImageData? (getting, changing and setting the values?).
> 
> Greetings,
> 
> Nico
> 
> 
> ====================================================
> Nico Vermaas
> ASTRON - Westerbork Synthesis Radio Telescope
> Schattenberg 1 - 9433 TA Zwiggelte - The Netherlands
> 
> tel: +31 593 598710                 
> vermaas at astron.nl 
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Mathieu Malaterre
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