diff --git a/openflexure_microscope/camera/pi.py b/openflexure_microscope/camera/pi.py
index d49af7e9..65fd8c35 100644
--- a/openflexure_microscope/camera/pi.py
+++ b/openflexure_microscope/camera/pi.py
@@ -484,7 +484,7 @@ class PiCameraStreamer(BaseCamera):
         use_video_port: bool = False,
         resize: Tuple[int, int] = None,
         bayer: bool = True,
-        thumbnail: tuple = None
+        thumbnail: tuple = None,
     ):
         """
         Capture a still image to a StreamObject.
@@ -516,7 +516,7 @@ class PiCameraStreamer(BaseCamera):
                 resize=resize,
                 bayer=(not use_video_port) and bayer,
                 use_video_port=use_video_port,
-                thumbnail=thumbnail
+                thumbnail=thumbnail,
             )
 
             # Set resolution and start stream recording if necessary
diff --git a/openflexure_microscope/captures/capture.py b/openflexure_microscope/captures/capture.py
index 2550c59d..ecee9462 100644
--- a/openflexure_microscope/captures/capture.py
+++ b/openflexure_microscope/captures/capture.py
@@ -8,13 +8,11 @@ import uuid
 from collections import OrderedDict
 
 import dateutil.parser
-from PIL import Image
 
 from openflexure_microscope.camera import piexif
 from openflexure_microscope.camera.piexif._exceptions import InvalidImageDataError
 from openflexure_microscope.config import JSONEncoder
 
-PIL_FORMATS = ["JPG", "JPEG", "PNG", "TIF", "TIFF"]
 EXIF_FORMATS = ["JPG", "JPEG", "TIF", "TIFF"]
 
 
diff --git a/openflexure_microscope/microscope.py b/openflexure_microscope/microscope.py
index f68ca1d9..22824815 100644
--- a/openflexure_microscope/microscope.py
+++ b/openflexure_microscope/microscope.py
@@ -386,7 +386,7 @@ class Microscope:
             # Capture to output object
             extras = {}
             if fmt == "jpeg":
-                extras["thumbnail"] = (200,150,85)
+                extras["thumbnail"] = (200, 150, 85)
             logging.info("Starting microscope capture %s", output.file)
             self.camera.capture(
                 output,
@@ -394,7 +394,7 @@ class Microscope:
                 resize=resize,
                 bayer=bayer,
                 fmt=fmt,
-                **extras
+                **extras,
             )
 
         output.put_and_save(tags, annotations, full_metadata)