[vtkusers] How does one enforce recognition of little endian data in VTK?

[Sanatan Sahgal]

Mathieu,

Thanks for the prompt response.

The data is not coming from a file. Prior to the data hitting any of the VTK 
classes it undergoes some pre-processing steps that I need to do. The bottom 
line is that the data feed to VTK is not from a file. So, using 
vtkImageReader class will not work. Is there any other way?

thanks,
Sanatan

>
>Sanatan,
>
>	Since you are reading from a file you should rather have a look at the 
>vtkImageReader class:
>
>http://www.vtk.org/doc/nightly/html/classvtkImageReader.html
>
>Since there is a member function that you need:
>
>vtkImageReader2::SetDataByteOrderToBigEndian()
>
>HTH
>Mathieu
>
>Sanatan Sahgal wrote:
>>Hello,
>>
>>I am using VTK on an Intel platform running Windows XP professional. I 
>>have a 2 bytes per pixel grayscale image which I wish to display on the 
>>screen using VTK.
>>
>>My image raw data is in little endian format and when I feed it to VTK I 
>>see garbage on the screen because VTK seems to expect it in big endian 
>>format. If I swap the bytes and then feed it to VTK the image shows up 
>>correctly on my screen.
>>
>>I don't want this extra overhead of swapping the bytes. I want VTK to 
>>recognize the raw little endian data just as it is. Is there any way to 
>>tell VTK that my data is in little endian format and it should read it as 
>>such?
>>
>>I am using the vtkImageData class. I feed data to the imageData instance 
>>as follows:
>>imageData->GetPointData()->SetScalars(pixelArrayVtk);
>>
>>The pixelArrayVtk instance is of type vtkDataArray and it is setup as 
>>follows:
>>pixelArrayVtk = CreateVtkDataArray(); //Creates instance of specific 
>>VtkDataArray type. Example: vtkShortArray::New()
>>pixelArrayVtk->SetVoidArray(imageRawData, totalSamples, 1);
>>
>>The imageRawData parameter is a pointer to the memory location which 
>>contains the raw image data in little endian format.
>>
>>Any help with this issue is appreciated.
>>
>>thanks,
>>Sanatan
>>
>>
>>_______________________________________________
>>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:
>>http://www.vtk.org/mailman/listinfo/vtkusers
>>
>