[vtkusers] vtkLookUpTable, what am I doing wrong?

Julian Humphries julian at essaustin.com
Thu May 3 10:11:34 EDT 2001

At 12:10 PM 5/2/2001 +0530, Prabhu Ramachandran wrote:

>     JH> However, the resulting table starts off with the first 16
>     JH> entries listed below This is not what I wanted. When applied
>     JH> to any grayscale image this LUT should change nothing (or at
>     JH> least that is what I want, as in later code I will be changing
>     JH> the min and max table range values to change image leveling).
>I notice the same problem that you report with both vtk3.2, vtknightly
>on Linux (i.e. the first 10 or so entries are all zero, also there are
>lots of repeated values).  I am not an expert on this but maybe it is
>because floats are being used in vtkLookupTable.cxx::Build() ?
>Should'nt this be a bad bug (after all scalar colouring is so
>important)?  I looked at the code briefly but dont understand much of

Can anyone confirm whether the resulting step valued LUT is in fact what is 
expected or not?

Julian Humphries
University of Texas

More information about the vtkusers mailing list