[vtkusers] Problem reading TIFF images

[varshini varshini]

I am tryting to read a set of TIFF images and create a 3D volume from it. 
The code below reads certain sets of images and not others. But I am able to 
view all the images in Photoshop. So, Is there something wrong in my code or 
can vtk read only certain TIFF files?

Thanks in advance,

CODE:

	vtkTIFFReader *Reader = vtkTIFFReader::New();
	Reader->SetFileDimensionality(3);
	Reader->SetFilePrefix ("z1-"); //Location of slices
    Reader->SetFilePattern("%s%.3d.tif");
    Reader->SetDataExtent (0,511,0,511,101,120); //No.of slices
	Reader->SetDataSpacing(1,1,1);
	Reader->SetDataByteOrderToLittleEndian();
	Reader->Update();




	vtkColorTransferFunction *colorTransferFunction = 
vtkColorTransferFunction::New();
	 colorTransferFunction->AddRGBPoint(0.0, 0.0, 0.0, 0.0);
	 colorTransferFunction->AddRGBPoint(255.0, 1.0, 1.0, 1.0);

	vtkPiecewiseFunction *oTFun =vtkPiecewiseFunction::New();
		oTFun->AddSegment(80,0.0,255,1.0);

	vtkVolumeRayCastCompositeFunction *compositeFunction= 
vtkVolumeRayCastCompositeFunction::New();
	vtkVolumeRayCastMapper *volMapper = vtkVolumeRayCastMapper::New();
    	volMapper->SetInput(Reader->GetOutput());
		volMapper->SetVolumeRayCastFunction(compositeFunction);

	vtkVolumeProperty *volProperty = vtkVolumeProperty::New();
		volProperty->SetColor(colorTransferFunction);
		volProperty->SetScalarOpacity(oTFun);
	volProperty->SetInterpolationTypeToLinear();
		volProperty->SetInterpolationTypeToNearest();

	vtkVolume *vol=vtkVolume::New();
		vol->SetMapper(volMapper);
		vol->SetProperty(volProperty);

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