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

[Orlinn]

Hello Jeromy,

i used the class vtkImageCast and it works.

 vtkImageReader rawreader= new vtkImageReader();
                rawRedaer.SetFileName("C:/Desktop/rawFile.dat");
                rawReader.SetDataExtent(0, 511, 0, 511, 0, 249);
                rawReader.SetDataScalarTypeToInt();
                rawReader.SetDataByteOrderToBigEndian();
                rawReader.SetFileDimensionality(3);
                rawReader.SetDataSpacing(0.40234375, 0.40234375, 0.5);
                rawReader.SetNumberOfScalarComponents(1);
                rawReader.Update();
          
               vtkImageCast cast= new vtkImageCast();
               cast.setInput(rawReader.getOutput());
               cast.SetOutputScalarTypeToUnsignedShort();
	       cast.Update();

Thank you very much Jeromy


Orlinn wrote:
> 
> hello Jeremy,
> 
> i will try to use your version with the class vtkImageCast maybe it works. 
> I used SetDataMask of vtkImageReader but it did not work but maybe with
> vtkImageCast
> 
> thank you
> 
> Jérôme-2 wrote:
>> 
>> 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:
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>>> 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:
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>> 
>> _______________________________________________
>> 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
>> 
>> Follow this link to subscribe/unsubscribe:
>> http://www.vtk.org/mailman/listinfo/vtkusers
>> 
>> 
> 
> 

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