diff --git a/portrait/utils/psgan_utils.py b/portrait/utils/psgan_utils.py
index 1665447..7ff4de2 100755
--- a/portrait/utils/psgan_utils.py
+++ b/portrait/utils/psgan_utils.py
@@ -830,7 +830,7 @@ class PostProcess:
 
         height, width = source.shape[:2]
         small_source = cv2.resize(source, (self.img_size, self.img_size))
-        laplacian_diff = source.astype(np.float) - cv2.resize(small_source, (width, height)).astype(np.float)
+        laplacian_diff = source.astype(np.float64) - cv2.resize(small_source, (width, height)).astype(np.float64)
         result = (cv2.resize(result, (width, height)) + laplacian_diff).round().clip(0, 255).astype(np.uint8)
         if self.denoise:
             result = cv2.fastNlMeansDenoisingColored(result)