.

rapids/models.py

@@ -457,11 +457,12 @@ class RapidImage(models.Model):
         if self.image:
             # Try and read the file as a dicom
             try:
+                # and generate a hash from the pixel data
                 hash = ",".join(pydicom.dcmread(self.image.path).pixel_array.tostring())
                 self.is_dicom = True
             except pydicom.errors.InvalidDicomError:
-                with self.image.open("r") as f:
-                    hash = hashlib.md5(f).hexdigest()
+                self.image.file.open()
+                hash = hashlib.md5(self.image.file).hexdigest()
 
             self.image_md5_hash = hash
         super().save(*args, **kwargs)  # Call the "real" save() method.