[vtkusers] Writing a JPEG from vtkActor

[Amy Squillacote]

Try using vtkImageShiftScale instead.  Do something like the following.

double range[2];
grid->GetCellData()->GetScalars("abc")->GetScalarRange(range);

vtkImageShiftScale *iss = vtkImageShiftScale::New();
iss->SetInput(grid);
iss->SetOutputScalarTypeToUnsignedChar();
iss->SetShift(-range[0]);
iss->SetScale((range[1] - range[0]) / 256.0);

Are you sure that the data in your grid (a vtkImageData, I assume) is 
in cell data? It's usually in point data.

- Amy

At 09:44 AM 12/20/2005, Dominik Szczerba wrote:
>Thanks a lot, yes, I am trying the vtkImageCast, compiles fine, but get
>a black image at the end. Shouldnt I set ranges somewhere?
>I can do
>
>grid->GetCellData()->GetScalars("abc")->GetRange())
>
>but where do I plug the output?
>
>Dominik
>
>Amy Squillacote wrote:
> > Try using either vtkImageCast or vtkImageShiftScale to change your image
> > data to contain either unsigned char or unsigned short data.
> >
> > - Amy
> >
> > At 08:58 AM 12/20/2005, Dominik Szczerba wrote:
> >
> >> What is the error? I try to do the same with vtkPNGWriter ending up with:
> >>
> >> vtkPNGWriter (0x8058948): PNGWriter only supports unsigned char and
> >> unsigned short inputs
> >>
> >> Meanwhile I try to figure out how to do the appropriate convertion in
> >> vtk.
> >> --dsz
> >>
> >> Marlos Fabris wrote:
> >> > Hi,
> >> >
> >> > I'm trying to write a jpeg file (using vtkJPEGWriter) from a vtkActor
> >> > but I can't accomplish this. I have a vtk file with structured points
> >> > data and I wish to transform to vtkPolyData and color it with my
> >> > vtkLookupTable.
> >> >
> >> > Is there a way to convert only my vtkActor to a vtkImageData, without
> >> > the frameborders of vtkWindowToImageFilter?
> >> >
> >> > Or is there a way to trim my image?
> >> >
> >> > Thank you in advance,
> >> >
> >> > Marlos Fabris
> >> > _______________________________________________
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> >>
> >> --
> >> Dominik Szczerba, Dr.
> >> ETZ C110 CO-ME/BIWI CH-8092 Zurich
> >> http://www.vision.ee.ethz.ch/~domi
> >> _______________________________________________
> >> This is the private VTK discussion list.
> >> Please keep messages on-topic. Check the FAQ at:
> >> http://www.vtk.org/Wiki/VTK_FAQ
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>
>--
>Dominik Szczerba, Dr.
>ETZ C110 CO-ME/BIWI CH-8092 Zurich
>http://www.vision.ee.ethz.ch/~domi
>_______________________________________________
>This is the private VTK discussion list.
>Please keep messages on-topic. Check the FAQ at: 
>http://www.vtk.org/Wiki/VTK_FAQ
>Follow this link to subscribe/unsubscribe:
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