def to_constant( v )
      v = v.to_s.upcase
      ColorScheme.const_get(v) if (ColorScheme.const_defined?(v, false) rescue ColorScheme.const_defined?(v))
    end
def to_constant( v )
      v = v.to_s.upcase
      ColorScheme.const_get(v) if (ColorScheme.const_defined?(v, false) rescue ColorScheme.const_defined?(v))
    end
Return a normalized representation of a color setting.