[vtkusers] Map double scalar values to grayscale

[Dominik Szczerba]

try this:

	 double range[2];
    input->GetCellData()->GetScalars(vname.c_str())->GetRange(range);
 	 double scaleFactor = 256.0/(range[1] - range[0]);
 	 inputMapper->SetScalarRange(range);

Dominik

Michnay Balázs wrote:
> Dear VTK Users,
> 
> I have a vtkDoubleArray which holds scalar data of an image. These 
> values can be even negative.
> I need to visualize this image so I need to map these values ranging 
> from  x-y (x can be negative...) to 0-255.
> So the final image should be a 8-bit grayscale image.
> I tried to look at previous threads but I found no solution to this. I tried 
> vtkLookupTable but I could not find out how to use it to achieve this (it 
> may not even be able to perform such thing...).
> 
> Any help would be greatly appreciated.
> 
> Thanks  lot,
> 
> MB.
> 
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-- 
Dominik Szczerba, Dr.
ETZ C110 CO-ME/BIWI CH-8092 Zurich
http://www.vision.ee.ethz.ch/~domi