better clipping detection in MOT number calculation

lib/imaging.py

@@ -188,7 +188,7 @@ class FluorescenceData(ImagingData):
 
 def compute_mot_number(image, QE, gain, exposure_time, solid_angle,
         detuning, intensity_parameter):
-    if image.max() >= 2**16:
+    if image.max() >= np.iinfo(image.dtype).max:
         print("[imaging] WARNING: image may contain clipping")
     electron_rate = image.astype(np.float64).sum() / 16 # get to 12-bit values
     photon_rate \