diff --git a/datasets/raise/extract_noise.py b/datasets/raise/extract_noise.py
index fe9fcd2..968e6c4 100755
--- a/datasets/raise/extract_noise.py
+++ b/datasets/raise/extract_noise.py
@@ -20,7 +20,8 @@ def treatImage(imageFileName):
     imageFilePath = f'{imagesFolderPath}/{imageFileName}'
     imagePil = Image.open(imageFilePath)
     imageNpArray = img_as_float(np.array(imagePil))
-    imageNoiseNpArray = imageNpArray - denoise_tv_chambolle(imageNpArray, weight=0.2, channel_axis=-1)
+    imageDenoisedNpArray = denoise_tv_chambolle(imageNpArray, weight=0.2, channel_axis=-1)
+    imageNoiseNpArray = imageNpArray - imageDenoisedNpArray
     if mean is None:
         mean = imageNoiseNpArray
     else: