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Difference in BGR values between C++ and Python

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Hello, I'm using OpenCV in C++ and Python and compare the results. I noticed that BGR values slightly differ (+/- 1, sometimes +/- 2) between those two languages after reading the same frame from a webcam. OpenCV in Python should actually be using C++ codes and so I'm not sure why the values differ. How can I get identical BGR values? Thanks in advance.

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