[vtkusers] Please help

[Ahmed Mahmoud]

Hello all,
I have 2D images 16 bit files , I opened the images with vtkVolume16Reader
and I made some image processing and transfer the file to
vtkStructuredPoints and I want to write it back to another file.

I tried the following without success
1) renderWin->SetFileName(File name);
     renderWin->SaveImageAsPPM ();
2) vtkPNMWriter *writer1
    writer1->SetFileName (file name);
    writer1->SetInput (vtkStructuredPoints * );
    writer1->Write ();
3) vtkStructuredPointsWriter *writer;
    writer->SetInput(vtkStructuredPoints * );
     writer->SetFileName(file name);
    writer->Write ();

Please , How can I save the resultant image to another file
Thank You .

Ahmed