[vtkusers] Re: vtkLookupTable vlues continued...

[Luca Pamparana]

There is a case to be made about incrementing the variables in the loop....
boy, one of those days!

On 4/18/07, Luca Pamparana <luca.pamparana at gmail.com> wrote:
>
> Hello everyone,
>
> I finally managed to get rid of the RGB and grayscale blending by simply
> switching the connection in the vtkImageBlend filter. However, I am still
> struggling with the vtkLookupTable and using it with  the
> vtkImageMapToWindowLevelColors filter.
>
> So, I am creating the table as follows:
>
> vtkImageMapToWindowLevelColors * iwlc = vtkImageMapToWindowLevelColors;
> vtkLookupTable * lut = vtkLookupTable::New();
>
> // Input is the input vtkImageData pointer.
> double * range = input->GetScalarRange();
>
> lut->SetTableRange (range[0], range[1]);
> lut->SetNumberOfTableValues(256);
> lut->Build();
>
> float r, g, b;
> r = g = b = 0.0;
>
> for (int i = 0; i < 256; i++)
> {
>      lut->SetTableValue(i, r/255.0f, g/255.0f, b/255.0f, 1.0);
> }
> iwlc->SetLookupTable(lut);
> iwlc->SetInput(input);
>
> Now, later when I get the output of the vtkImageMapToWindowLevelColors
> filter object as:
>
> iwic->GetOutput();
>
> then the scalar range for the output data is always 0 - 0. I have tried
> using calls to update but to no avail.
>
> I would really appreciate some help from experts who have experience using
> these filters.
>
> Thanks,
>
> Luca
>
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