[vtkusers] the use of vtkImageViewer

[月]

hi,everyone
  
 I'm the beginner of vtk,when I'm tried to use the class of vtkDICOMImageReader to read a file,in which I have changed the data type to "unsigned char",and then use the class of vtkImageactor.
 But I got the erro below in the vtkOutputWindow when I run it.
 ERROR: In ..\..\..\src\vtk-5.8.0\Rendering\vtkImageActor.cxx, line 266
vtkOpenGLImageActor (027A0920): This filter requires unsigned char scalars as input
 Does anybody could give me some  help? Thanks very much!
  
 yue
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