public class MeasurementDelta : MeasurementShape

using Flir.Atlas.Image;

using (ThermalImageFile image = new ThermalImageFile(File))
{            
       var tmp = image.Measurements;
       //add a delta from MeasurementRectangle max to MeasurementEllipses min in the image
       var delta = tmp.Add(image.Measurements.MeasurementRectangles[0].Name, ValueMember.Max,
           image.Measurements.MeasurementEllipses[0].Name, ValueMember.Min);

       //add a delta from the ReferenceTemperature to MeasurementEllipses min in the image
       var delta2 = tmp.Add("ReferenceTemperature", ValueMember.Max,
          image.Measurements.MeasurementEllipses[0].Name, ValueMember.Min);

       image.Save();
}