private void OnePointOperation(string operation)
{
if (operation == "ThreshHoldGraySave")
{
mainImage.ThresholdLevelSave(startThLevel, endThLevel);
InvalidateImage();
}
else if (operation == "StretchGrayLevel")
{
mainImage.StretchGrayLevel(startThLevel, endThLevel);
InvalidateImage();
}
else
{
mainImage.OnePointOperation(operation);
InvalidateImage();
}
}