diff --git a/source/py_tutorials/py_core/py_image_arithmetics/py_image_arithmetics.rst b/source/py_tutorials/py_core/py_image_arithmetics/py_image_arithmetics.rst
index 86895c9..5b0ad32 100644
--- a/source/py_tutorials/py_core/py_image_arithmetics/py_image_arithmetics.rst
+++ b/source/py_tutorials/py_core/py_image_arithmetics/py_image_arithmetics.rst
@@ -83,14 +83,14 @@ I want to put OpenCV logo above an image. If I add two images, it will change co
 
     # Now create a mask of logo and create its inverse mask also
     img2gray = cv2.cvtColor(img2,cv2.COLOR_BGR2GRAY)
-    ret, mask = cv2.threshold(img2gray, 10, 255, cv2.THRESH_BINARY)
+    ret, mask = cv2.threshold(img2gray, 150, 255, cv2.THRESH_BINARY)
     mask_inv = cv2.bitwise_not(mask)
 
     # Now black-out the area of logo in ROI
-    img1_bg = cv2.bitwise_and(roi,roi,mask = mask_inv)
+    img1_bg = cv2.bitwise_and(roi,roi,mask = mask)
 
     # Take only region of logo from logo image.
-    img2_fg = cv2.bitwise_and(img2,img2,mask = mask)
+    img2_fg = cv2.bitwise_and(img2,img2,mask = mask_inv)
 
     # Put logo in ROI and modify the main image
     dst = cv2.add(img1_bg,img2_fg)