Oh, at last I did it. I don't know why people say who an image can be shown in VTK straight forward. But here it is at last.
The piece of code is written by TCL , using vtk. The brain.tif is in the same directory as the tcl file.
# create image reader
#source object for reading tiff files
vtkTIFFReader tiffR
tiffR SetFileName brain.tif
#tiffR Update
#vtkImageViewer is a convenience class for displaying a 2d image.
#It packages up the functionality found in vtkRenderWindow, vtkRenderer, vtkActor2D and vtkImageMapper into a single easy to use class.
#Behind the scenes these four classes are actually used to to provide the required functionality. vtkImageViewer is simply a wrapper around them.
vtkImageViewer vw
vw SetInput [ tiffR GetOutput ]
#set the slice to be viewed
vw SetZSlice 0
vw SetColorLevel 128
vw SetColorWindow 255
vw Render
wm withdraw .
vwait forever
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