[vtkusers] re ad a raw file (32-bit signed integers) with vtkImageReader

[Jérôme]

Hi again,

I never used that but it may be what you want: there is a SetDataMask
function in vtkImageReader. Try to set it as you want. Then, connect your
reader to a vtkImageCast filter. This should do the trick.

HTH,
Jerome

2009/10/19 Orlinn <MeinDatenLaufwerk at googlemail.com>

>
> hello jerome,
>
> i use the data from vtkImageReader show the the MIP (maximum intensity
> projection) but i see not the right result. With other raw files it works.
> i
> have to use  SetDataScalarTypeToUnsignedShort() or
> SetDataScalarTypeToUnsignedChar() because vtkVolumeRayCastMapper can only
> render data of type unsigned Short or unsigned char.
>
> i use 32-bit signed integer so i have 4 bytes and i need the last 2 bytes.
> but i have no ideas how can cast these data into unsigned Short or unsigned
> Char.
>
> thank you
>
>
>
> Jérôme-2 wrote:
> >
> > Hi,
> >
> > First of all, I thought that unsigned short are 2 bytes integers. Correct
> > me
> > if I mistake!
> > Then, could you give more precision on what doesn't work? Do you get a
> VTK
> > error message, an empty volume, a segfault, or something else?
> >
> > Best regards,
> > Jerome
> >
> > 2009/10/19 Orlinn <MeinDatenLaufwerk at googlemail.com>
> >
> >>
> >> hello VTK world,
> >>
> >> i have a raw(32-bit signed integers) file which contains my images.
> >> From the 4 bytes i need only the 2 last bytes, i thought i can set a
> mask
> >> like 0x00FF.
> >> but it does not work. I use the the class vtkImageReader.
> >> When i try with 16 and 8 bit raw files, it works.
> >>
> >> this is my code
> >>                vtkImageReader rawreader= new vtkImageReader();
> >>                rawRedaer.SetFileName("C:/Desktop/rawFile.dat");
> >>                rawReader.SetDataExtent(0, 511, 0, 511, 0, 249);
> >>                rawReader.SetDataScalarTypeToUnsignedShort();
> >>                rawReader.SetDataByteOrderToBigEndian();
> >>                rawReader.SetFileDimensionality(3);
> >>                rawReader.SetDataSpacing(0.40234375, 0.40234375, 0.5);
> >>                rawReader.SetNumberOfScalarComponents(1);
> >>                rawReader.Update();
> >>
> >> can somebody tell me what i have to add????
> >>
> >> sorry for my english and my VTK knowledge
> >>
> >> thank you
> >> --
> >> View this message in context:
> >>
> http://www.nabble.com/read-a-raw-file-%2832-bit-signed-integers%29-with-vtkImageReader-tp25956561p25956561.html
> >> Sent from the VTK - Users mailing list archive at Nabble.com.
> >>
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> --
> View this message in context:
> http://www.nabble.com/read-a-raw-file-%2832-bit-signed-integers%29-with-vtkImageReader-tp25956561p25956898.html
> Sent from the VTK - Users mailing list archive at Nabble.com.
>
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the VTK FAQ at:
> http://www.vtk.org/Wiki/VTK_FAQ
>
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