diff --git a/samples/cpp/tutorial_code/core/how_to_scan_images/how_to_scan_images.cpp b/samples/cpp/tutorial_code/core/how_to_scan_images/how_to_scan_images.cpp
index b020c5ec13..700e27fc6c 100644
--- a/samples/cpp/tutorial_code/core/how_to_scan_images/how_to_scan_images.cpp
+++ b/samples/cpp/tutorial_code/core/how_to_scan_images/how_to_scan_images.cpp
@@ -129,8 +129,8 @@ Mat& ScanImageAndReduceC(Mat& I, const uchar* const table)
 
     int channels = I.channels();
 
-    int nRows = I.rows * channels;
-    int nCols = I.cols;
+    int nRows = I.rows;
+    int nCols = I.cols * channels;
 
     if (I.isContinuous())
     {