Christmas Light Fixer (Incandescent LUT)

christmas_light_fixer.h

// This function reduces harsh blue tones in RGB LED lights, bringing
// them closer to the look of retro tinted incandescent bulbs.
//
// All input colors to the christmas_light_fixer() function are multiplied
// by a LUT of a warm white, reducing the power of the blue spectrum while
// preserving the brightness of the yellow spectrum.

CRGB christmas_light_fixer( CRGB input_color ){
  CRGB incandescent_lookup = CRGB( 255, 113, 40 );
  CRGB out_color = input_color;
  
  out_color.r = uint16_t(out_color.r * incandescent_lookup.r) >> 8;
  out_color.g = uint16_t(out_color.g * incandescent_lookup.g) >> 8;
  out_color.b = uint16_t(out_color.b * incandescent_lookup.b) >> 8;
  
  return out_color;
}

// --------------------------------------------------------------
// Try this function out like this:

// Shows the full color spectrum on your LED strip, and toggles the incandescent LUT on and off every 2 seconds.
void loop(){
  static bool fixer_enabled = true; // Used for toggling
 
  for(uint16_t i = 0; i < NUM_LEDS; i++){
    float progress = i / float(NUM_LEDS); // gives each LED a value between 0.0 and 1.0
    CRGB raw_color = CHSV(255*progress, 255, 255); // Whole color wheel at full saturation
    
    // --------------------------------------------------------------------------------
    CRGB pretty_color = christmas_light_fixer( raw_color ); // Apply the color fixer
    // --------------------------------------------------------------------------------
    
    if(fixer_enabled){
      leds[i] = pretty_color;
    }
    else{
      leds[i] = raw_color;
    }
  }
  
  FastLED.show();
  delay(2000);
  
  fixer_enabled = !fixer_enabled; // toggle on and off
}