private void SaveOpacities(object obj)
 {
     if (Opacities.Count() > 0)
     {
         foreach (Opacity opac in Opacities)
         {
             opac.Save();
         }
     }
 }
        private void createOpacities()
        {
            int currentBrightness = 0;
            int maxShades         = 255 / BrightnessFactor;

            Opacities.Clear();
            for (int i = 0; i < maxShades; ++i)
            {
                Opacities.Add(new Opacity(currentBrightness, currentBrightness, currentBrightness));
                currentBrightness += BrightnessFactor;
            }

            OnPropertyChanged("OpacityCount");
        }