[vtkusers] How to write LUT to color some specific Scalar values

[Pratheek Arora]

Hi 
  I am facing one problem, I want only specific scalar value in the
imagedata to be color while all other scalar remain untouch, Can any one
tell me how to write LUT for that.
Right now my lut change the whole scalar value to different color , while
the vtkcompositefunction is only used with vtkVolume
Can any one in the group know How to color some specific Scalar range to
color while all other scalar will remain untouch
I am waiting a quick reply from users
Thanks in advance
Prateek 

PRATEEK ARORA
Wipro GE Medical Systems
John F Welch Technology Centre
Export Promotion Industrial Park,
Plot 122, Phase-2, Whitefield Road
Bangalore: 560066. 
phone 8412050 - 3178