diff --git a/api/onnx_web/image.py b/api/onnx_web/image.py
index 6093b3f8..de0d3f43 100644
--- a/api/onnx_web/image.py
+++ b/api/onnx_web/image.py
@@ -179,7 +179,8 @@ def expand_image(
 
     full_mask = mask_filter(mask_image, dims, origin)
     full_noise = noise_source(source_image, dims, origin)
-    # TODO: multiply noise by mask before compositing
+    full_noise = ImageChops.multiply(full_noise, full_mask)
+
     full_source = Image.composite(full_noise, full_source, full_mask.convert('L'))
 
     return (full_source, full_mask, full_noise, (full_width, full_height))