exposure or skin color in image

  c++, computer-vision, image-processing, light, python

How to detect/differentiate underexposure vs dark-skin in a face image?

The face image on the left side is white (Caucasian) having underexposure and the face image on the right is dark-skin having no underexposure. The background in the image is variable. How to detect that the image on left side is underexposed and the image on right side is good?

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Source: Windows Questions C++

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