diff --git a/fiftyone/core/labels.py b/fiftyone/core/labels.py
index 64a58d4eef..139896533a 100644
--- a/fiftyone/core/labels.py
+++ b/fiftyone/core/labels.py
@@ -470,49 +470,6 @@ def export_mask(self, outpath, update=False):
                 self.mask = None
                 self.mask_path = outpath
 
-    def transform_mask(self, targets_map, outpath=None, update=False):
-        """Transforms this instance's mask according to the provided targets
-        map.
-
-        This method can be used to transform between grayscale and RGB masks,
-        or it can be used to edit the pixel values or colors of a mask without
-        changing the number of channels.
-
-        Note that any pixel values not in ``targets_map`` will be zero in the
-        transformed mask.
-
-        Args:
-            targets_map: a dict mapping existing pixel values (2D masks) or RGB
-                hex strings (3D masks) to new pixel values or RGB hex strings.
-                You may convert between grayscale and RGB using this argument
-            outpath (None): an optional path to write the transformed mask on
-                disk
-            update (False): whether to save the transformed mask on this
-                instance
-
-        Returns:
-            the transformed mask
-        """
-        mask = self.get_mask()
-        if mask is None:
-            return
-
-        mask = _transform_mask(mask, targets_map)
-
-        if outpath is not None:
-            _write_mask(mask, outpath)
-
-            if update:
-                self.mask = None
-                self.mask_path = outpath
-        elif update:
-            if self.mask_path is not None:
-                _write_mask(mask, self.mask_path)
-            else:
-                self.mask = mask
-
-        return mask
-
     def to_polyline(self, tolerance=2, filled=True):
         """Returns a :class:`Polyline` representation of this instance.
 
diff --git a/fiftyone/utils/coco.py b/fiftyone/utils/coco.py
index 2bfcc42506..44a2e69426 100644
--- a/fiftyone/utils/coco.py
+++ b/fiftyone/utils/coco.py
@@ -1304,7 +1304,7 @@ def from_label(
             x, y, w, h = label.bounding_box
             bbox = [x * width, y * height, w * width, h * height]
 
-            if label.get_mask() is not None:
+            if label.has_mask() is not None:
                 segmentation = _instance_to_coco_segmentation(
                     label, frame_size, iscrowd=iscrowd, tolerance=tolerance
                 )
@@ -2116,7 +2116,7 @@ def _coco_objects_to_detections(
         )
 
         if detection is not None and (
-            not load_segmentations or detection.get_mask() is not None
+            not load_segmentations or detection.has_mask() is not None
         ):
             detections.append(detection)
 
diff --git a/fiftyone/utils/cvat.py b/fiftyone/utils/cvat.py
index 9df03932d0..f546909543 100644
--- a/fiftyone/utils/cvat.py
+++ b/fiftyone/utils/cvat.py
@@ -6400,7 +6400,7 @@ def _create_detection_shapes(
                     }
                 )
             elif label_type in ("instance", "instances"):
-                if det.get_mask() is None:
+                if det.has_mask() is None:
                     continue
 
                 polygon = det.to_polyline()