biasedColor

  static Color biasedColor(Color color, float offset){
    float value = (color.r + color.g + color.b) / 3.0;
    float newValue = value+2.0*((float)random(0,10000)/10000.0)*offset-offset;
    float valueRatio = newValue / value;
    int R = (int)((float)color.r * valueRatio);
    int G = (int)((float)color.g * valueRatio);
    int B = (int)((float)color.b * valueRatio);
    return Color(R,G,B);
  }
  
  static Color fadeColor(Color color, float ratio) {
    Color newColor;
    newColor.r = color.r * ratio;
    newColor.g = color.g * ratio;
    newColor.b = color.b * ratio;
    return newColor;
  }