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

[Orlinn]

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
>> --
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>>
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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.