[vtkusers] Convert from RGBA values to the index in the VTK Lookup Table

[Kanghong Li]

Anyone knows a way to convert from RGB values (3 numbers + A if needed) to the scalar/index (a value between 0 and 1) in the default vtk lookup table? Thanks.

For example, RGB (51,51,255), can I get a value between 0 and 1 (index to the vtk lookup table) from that 3 numbers?
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