add pixel size getter

tomoscan/esrf/edfscan.py

@@ -417,7 +417,7 @@ class EDFTomoScan(TomoScanBase):
         return self.__energy
 
     @staticmethod
-    def _get_pixel_size(scan: str) -> Union[None, int]:
+    def _get_pixel_size(scan: str) -> Union[None, float]:
         if os.path.isdir(scan) is False:
             return None
         value = EDFTomoScan.retrieve_information(scan=scan,

tomoscan/scanbase.py

@@ -142,9 +142,15 @@ class TomoScanBase:
         raise NotImplementedError('Base class')
 
     @property
-    def pixel_size(self) -> Union[None, int]:
+    def pixel_size(self) -> Union[None, float]:
         raise NotImplementedError('Base class')
 
+    def get_pixel_size(self, unit='m') -> Union[None, float]:
+        if self.pixel_size:
+            return self.pixel_size / MetricSystem.from_value(unit)
+        else:
+            return None
+
     @property
     def dim_1(self) -> Union[None, int]:
         raise NotImplementedError('Base class')