fix 8 bit flag

nd2tif/__main__.py

@@ -22,9 +22,7 @@ logger = logging.getLogger(__name__)
 @click.option(
     '--to_8bits',
     is_flag=True,
-    default=True,
-    show_default=True,
-    help='converto to 8 bits'
+    help='convert to 8 bits'
 )
 @click.option(
     '--log', type=str, default='info',

nd2tif/transform.py

@@ -38,7 +38,7 @@ class Well(ImageJStack):
 
     def downscale(self, factor):
         array = downscale_local_mean(self.array, (1, 1, 1, factor, factor, 1))
-        return Well(array, self.order, self.calibration_um * factor)
+        return Well(array.astype('uint16'), self.order, self.calibration_um * factor)
 
     def to_8bits(self):
         arr = self.array.astype("f")