[vtkusers] Possible bug in vtkLookupTable

[Joey Mukherjee]

There might be a small problem with vtkLookupTable when used with a log 
scaling.

First, I am assuming that vtkLogLookupTable and vtkLookupTable with 
SetScaleToLog10 are equivalent.  Is this wrong?

However, in Graphics/Testing/Tcl/HyperScalarBar.tcl, if you replace the 
vtkLogLookupTable with vtkLookupTable and SetScaleToLog10, you get a 
logarithimic scaled color bar where the colors have too much red 
instead of a nice linear progression with vtkLogLookupTable.  The plot 
is still technically accurate, but not as nice a looking color bar.

Joey