private async void UpdateImage()
{
var diff = _optimizer.ColorsCount - numericUpDown1.Value.ToInt();
if (diff > 0)
{
_optimizer.Progress.ProgressChanged += Progress_ProgressChanged;
GUIDisable();
await _optimizer.DeleteColorsAsync(diff);
_optimizer.Progress.ProgressChanged -= Progress_ProgressChanged;
GUIReady();
_area.Redraw();
}
else if (diff < 0)
{
_optimizer.Progress.ProgressChanged += Progress_ProgressChanged;
GUIDisable();
await _optimizer.RestoreColorsAsync(-diff);
_optimizer.Progress.ProgressChanged -= Progress_ProgressChanged;
GUIReady();
_area.Redraw();
}
}