void SetBaseColors(std::vector<double> & base_color);
double GetBaseColors(unsigned int index);
void SetGreyLevelBoundaries(std::vector<double> & grey_level_boundary);
void SetBaseColors(std::vector<double> & base_color);
double GetBaseColors(unsigned int index);
void SetGreyLevelBoundaries(std::vector<double> & grey_level_boundary);