[vtkusers] Map RGBA from JColorChooser to an index in vtk default lookup table

[Kanghong Li]

I am trying to convert from the RGBA values returned from Java JColorChooser to an index in the vtk lookup table. Somehow the following
conversion:
0.299*R + 0.587*G + 0.114*B or A*(0.299*R + 0.587*G + 0.114*B).
did not give me the right index to the vtk lut. In other words, the color from lut did not match the one selected from the JColorChooser.

Anyone knows what could cause the problem? Any solutions? Thanks.
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