[vtkusers] Convert image data to polydata

[cspl]

Dear Sir,
I have worked that sample.It works fine.In that it is working for  3 components.But we have 1 component that is dicom images. vtkImageLuminance class SetInput function takes only 3 components.
Its giving  color image output.Actually I want Gray image not color image.I need to convert imagedata(read from dicom file) to polydata.
so,please givem me suggesition for this.
Thank you,
satyanarayana.
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