Lepton 2.5 not giving accurate temperature

I am using Lepton 2.5 to get the temperature distribution in my face. I am running the example script. I dont get the accurate temperature from the lepton. I am running it in grayscale.

Notice that this is an estimated temp.
If you want to be more accurate please norrow down the rectangle box to point excactly on your forehead.
Adjust linits at 25-45.
Get statistics from the rect blob using a list of 1-254 instead of the threshold list of the blob.