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Difference in pixel intensity regarding a black and white area in the image

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Akhilkrishna Panamkoottathil Ramakrishnan
I need to find the contrast behaviour of my camera. So i projected vertically divided gray and black image to screen and took photos. How to find difference in pixel intensity regarding a black and white area in the image?
My idea was, find histogram from black area and white area. Then substract. I am expecting a result which is attached.
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