          logger.info("[SORT INDEXES]")  # Tidy up cli output
          reindexed = self.reindex_faces()
          if reindexed:
              self._alignments.save()
          if self.faces:
              rename = Rename(self._alignments, None, self.faces)
              rename.process()
  
      def reindex_faces(self):
          """ Re-Index the faces """
          reindexed = 0
          for alignment in tqdm(self._alignments.yield_faces(),
 
</s> remove     @staticmethod
    def get_faces(arguments):
        """ If faces argument is specified, load faces_dir otherwise return None """
        if not hasattr(arguments, "faces_dir") or not arguments.faces_dir:
            return None
        faces = Faces(arguments.faces_dir)
        return faces

 </s> add  </s> remove         rename_mappings = self._build_rename_list()
 </s> add         rename_mappings = sorted([(face["current_filename"], face["original_filename"])
                                  for face in self._faces.file_list_sorted
                                  if face["current_filename"] != face["original_filename"]],
                                 key=lambda x: x[1]) </s> remove 

class UpdateHashes():
    """ Update hashes in an alignments file """
    def __init__(self, alignments, arguments):
        logger.debug("Initializing %s: (arguments: %s)", self.__class__.__name__, arguments)
        self._alignments = alignments
        self.faces = Faces(arguments.faces_dir).file_list_sorted
        self.face_hashes = dict()
        logger.debug("Initialized %s", self.__class__.__name__)

    def process(self):
        """ Update Face Hashes to the alignments file """
        logger.info("[UPDATE FACE HASHES]")  # Tidy up cli output
        self.get_hashes()
        updated = self.update_hashes()
        if updated == 0:
            logger.info("No hashes were updated. Exiting")
            return
        self._alignments.save()
        logger.info("%s frame(s) had their face hashes updated.", updated)

    def get_hashes(self):
        """ Read the face hashes from the faces """
        logger.info("Getting original filenames, indexes and hashes...")
        for face in self.faces:
            filename = face["face_name"]
            extension = face["face_extension"]
            if "_" not in face["face_name"]:
                logger.warning("Unable to determine index of file. Skipping: '%s'", filename)
                continue
            index = filename[filename.rfind("_") + 1:]
            if not index.isdigit():
                logger.warning("Unable to determine index of file. Skipping: '%s'", filename)
                continue
            orig_frame = filename[:filename.rfind("_")] + extension
            self.face_hashes.setdefault(orig_frame, dict())[int(index)] = face["face_hash"]

    def update_hashes(self):
        """ Update hashes to alignments """
        logger.info("Updating hashes to alignments...")
        updated = 0
        for frame, hashes in self.face_hashes.items():
            if not self._alignments.frame_exists(frame):
                logger.warning("Frame not found in alignments file. Skipping: '%s'", frame)
                continue
            if not self._alignments.frame_has_faces(frame):
                logger.warning("Frame does not have faces. Skipping: '%s'", frame)
                continue
            existing = [face.get("hash", None)
                        for face in self._alignments.get_faces_in_frame(frame)]
            if any(hsh not in existing for hsh in list(hashes.values())):
                self._alignments.add_face_hashes(frame, hashes)
                updated += 1
        return updated
 </s> add  </s> remove         self._faces = faces if faces else Faces(arguments.faces_dir)
 </s> add         kwargs = dict()
        if alignments.version < 2.1:
            # Update headers of faces generated with hash based alignments
            kwargs["alignments"] = alignments
        self._faces = faces if faces else Faces(arguments.faces_dir, **kwargs)
            logger.warning("If you have a face-set corresponding to the alignment file you "
                           "processed then you should run the 'Extract' job to regenerate it.")
          logger.info("[SORT INDEXES]")  # Tidy up cli output
          reindexed = self.reindex_faces()
          if reindexed:
              self._alignments.save()
            logger.warning("If you have a face-set corresponding to the alignment file you "
                           "processed then you should run the 'Extract' job to regenerate it.")
            logger.warning("If you have a face-set corresponding to the alignment file you "
                           "processed then you should run the 'Extract' job to regenerate it.")
            logger.warning("If you have a face-set corresponding to the alignment file you "
                           "processed then you should run the 'Extract' job to regenerate it.")
  
      def reindex_faces(self):
          """ Re-Index the faces """
          reindexed = 0
          for alignment in tqdm(self._alignments.yield_faces(),
keep keep keep keep replace replace replace keep keep keep keep keep
 Update extracted faces to use PNG EXIF data (#1123)

Documentation
  - Update Usage.md, align.rst and image.rst
lib.image.py
  - read_image - Remove hash return, add metadata return
  - Remove read_image_hash functions
  - Add read_image_meta functios
  - Replace encode_image_with_hash with encode_image (to store metadata)
  - Add png meta reading and writing functions
  - Update Image Loaders/Savers to handle metadata rather than hashes
lib.training_data
  - Naming updates to remove references to hashes
lib.align.Alignments
  - Add versioning notes
  - Increment alignments version to 2.1
  - Deprecate hashing lookup functions
  - Replace filter_hashes with filter_faces
lib.align.detected_face
  - DetectedFace
    - Remove hash property
    - Add png header data serializing/deserializing functions
  - Mask
    - Add png header data serializing/deserializing functions
  - add update_legacy_png_header function to update png meta data
lib.cli.args - Deprecate alignments files for training
- plugins.train.trainer
  - Update alignments/mask code to read png header data
- scripts.convert
  - Aligned images folder - read data from png headers
- scripts.extract
  - Write png header information and no longer store hash of face
- tools.alignments
  - remove leftover-faces, merge and update-hashes jobs
  - Update jobs to use png meta data rather than hashes
- tools.manual
  - Update extract code to output png meta data and don't store hashes
  - Perform check on launch that tool is not pointing at a faces folder
tools.mask
  - Update to use png meta data
tools.sort
  - Update to use png meta data 
tools/alignments/jobs.py