code: function create_gamma_table(steps, gamma, warning) {
      // used to build a gamma table for a particular value
  
      if (! warning && gamma == GAMMA_DEFAULT && ! global.IS_TEST_MODE) {
          console.info("INFO: Default gamma behaviour is changing");
          console.info("0.9 - gamma=1.0 - consistent with pre-gamma values");
          console.info("0.10 - gamma=2.8 - default fix for WS2812 LEDs");
          warning = true;
      }
  
      var g_table = new Array(steps);
      for (let i = 0; i < steps; i++) {
          g_table[i] = Math.floor(Math.pow((i / 255.0), gamma) * 255 + 0.5);
      }
  
      return g_table;
  }
docs: helper function for building gamma values