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Producing negative of a grayscale image: C++ and OpenCV

The concept behind negative of grayscale image is very simple. Just subtract each intensity level of an image from 255. The negative transformation is given by the function
  s = L – 1 – r
Where s is the pixel after transformation, r is the pixel before transformation and L is the maximum intensity level (in our case it is 256).

The program is written in C++ using OpenCV library in QT IDE. If you are using QT IDE then add the following line of code in .pro file.

INCLUDEPATH += /usr/include/opencv/
CONFIG += link_pkgconfig
PKGCONFIG += opencv
LIBS += -Icv -Ihighhui



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destination source:https://www.programming-techniques.com/2013/01/producing-nagative-of-grayscale-image-c.html