code: private int lighten(int color){
          float[] hsv = new float[3];
          Color.colorToHSV(color, hsv);
          hsv[2] = 1.0f - 0.8f * (1.0f - hsv[2]);
          color = Color.HSVToColor(hsv);
          return color;
      }
docs: Get a lighter color for a given color
  
  @param color     the color to lighten
  @return          the lightened color