diff --git a/retinex.py b/retinex.py
index 8d043e6..5bdae25 100644
--- a/retinex.py
+++ b/retinex.py
@@ -13,7 +13,7 @@ def multiScaleRetinex(img, sigma_list):
     for sigma in sigma_list:
         retinex += singleScaleRetinex(img, sigma)
 
-    retinex = retinex / len(sigma_list)
+    retinex = retinex / len(sigma_list) * 2
 
     return retinex