[vtkusers] trouble in saving an image in VTK

[dev]

Hi all,


I got the Zbuffer from the renderer Window:

*float* zbuffer=renderWindow->GetZbufferData(0,0,HEIGHT-1,WIDTH-1);*

And I save this zbuffer to an image (bmp), using a function:
http://vtk.1045678.n5.nabble.com/file/n5059065/depth.jpg 
*SaveZBufferToImage( HEIGHT-1 , WIDTH-1, zbuffer1 , "zbuffer1.bmp" ); *

I put the code of SaveZbufferToImage function here:
void SaveZBufferToImage( int height , int width , float *ZBuffer , const
char *FileImage )
{
         vtkImageData *pZImage = vtkImageData::New();
		
         pZImage->SetExtent( 0 , height , 0 , width , 0 ,0);
         pZImage->SetOrigin( 0.0 , 0.0 , 0.0 );
         pZImage->SetSpacing(1.0,1.0,1.0);
         pZImage->SetScalarTypeToUnsignedChar();
         pZImage->SetNumberOfScalarComponents( 1 );
         pZImage->AllocateScalars();
        
		 unsigned char *zPtr= static_cast<unsigned char *>
(pZImage->GetScalarPointer(0.0,0.0,0.0));

        for( int i = 0 ; i < height * width ; i++ )
        {
                 zPtr[i] = 255-ZBuffer[i]*255;
        }

         vtkBMPWriter *pDepthImageWriter = vtkBMPWriter::New();
         pDepthImageWriter->SetInput( pZImage );
         pDepthImageWriter->SetFileName( FileImage );
         pDepthImageWriter->Write();
} 

And I get an image with a *white band above as you can see in the image that
I attached*. Perhaps I have a problem of dimensions, but I didn't find
anything. 

Please help

Thank you

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