private void UpdateFromLevelsOp()
{
disable_updating = true;
spinInHigh.Value = MaskAvg (Levels.ColorInHigh);
spinInLow.Value = MaskAvg (Levels.ColorInLow);
float gamma = MaskGamma ();
int lo = MaskAvg (Levels.ColorOutLow);
int hi = MaskAvg (Levels.ColorOutHigh);
spinOutHigh.Value = hi;
spinOutGamma.Value = gamma;
spinOutLow.Value = lo;
disable_updating = false;
}