Watch the video - it's a change of light. Nothing more.
I would like to see the darkened version of the female in the back ground of image (a). It qould be very interesting to see a full body and face shot of that particular female, so that a comparison could be made against the other light enhanced image posted. Of course, once you start interferring with the image (a) using special effects, getting to the absolute truth becomes harder, and harder...
If both images appear in the tv documentary, the dark version, and the light version, then both cannot be originals, one has to have been interferred with...