diff --git a/models/vista2d/configs/metadata.json b/models/vista2d/configs/metadata.json
index 067b579a..a1cba412 100644
--- a/models/vista2d/configs/metadata.json
+++ b/models/vista2d/configs/metadata.json
@@ -1,7 +1,8 @@
 {
     "schema": "https://github.com/Project-MONAI/MONAI-extra-test-data/releases/download/0.8.1/meta_schema_20240725.json",
-    "version": "0.2.8",
+    "version": "0.2.9",
     "changelog": {
+        "0.2.9": "fix unsupported data dtype in findContours",
         "0.2.8": "remove relative path in readme",
         "0.2.7": "enhance readme",
         "0.2.6": "update tensorrt benchmark results",
diff --git a/models/vista2d/scripts/components.py b/models/vista2d/scripts/components.py
index 454356c0..61b89c8d 100644
--- a/models/vista2d/scripts/components.py
+++ b/models/vista2d/scripts/components.py
@@ -251,6 +251,7 @@ def __call__(self, data):
                 cv2.imwrite(output_filepath, image)
                 logger.info(f"Overlay Masks: Saving {output_filepath}")
             else:
+                label = cv2.convertScaleAbs(label, alpha=255.0 / label.max())
                 contours, _ = cv2.findContours(label, cv2.RETR_LIST, cv2.CHAIN_APPROX_SIMPLE)
                 polygons.extend(self.to_polygons(contours))