diff --git a/datasets/raise/extract_noise.py b/datasets/raise/extract_noise.py
index edf04e5..3b330c2 100755
--- a/datasets/raise/extract_noise.py
+++ b/datasets/raise/extract_noise.py
@@ -54,7 +54,7 @@ def treatImage(imageFileName, computeExtremes = False):
                 if maxColor is None or greenRawImageVisibleMax > maxColor:
                     maxColor = greenRawImageVisibleMax
                 return
-            imageNpArray = (greenRawImageVisible - minGreen) / (maxGreen - minGreen)
+            imageNpArray = (greenRawImageVisible - minColor) / (maxColor - minColor)
             # Pay attention to range of values expected by the denoiser.
             # Indeed if provide the thousands valued raw image, then the denoiser only returns values between 0 and 1 and making the difference between both look pointless.
     else: