diff --git a/datasets/raise/extract_noise.py b/datasets/raise/extract_noise.py
index 21491b5..4cb5824 100755
--- a/datasets/raise/extract_noise.py
+++ b/datasets/raise/extract_noise.py
@@ -117,7 +117,7 @@ def treatImage(imageFileName, computeExtremes = False, color = None):
         case 'tv_chambolle':
             imageDenoisedNpArray = denoise(imageNpArray, weight=0.2)
         case 'mean':
-            imageDenoisedNpArray = imageNpArray - means[color]
+            imageDenoisedNpArray = means[color]
     imageNoiseNpArray = imageNpArray - imageDenoisedNpArray
     if mean is None:
         mean = imageNoiseNpArray