Actually theres two reasons. 1) the camera can only pick up certain value ranges at a time and it will take priority over it. 2) Lighting scenarios , dude is in low artificial lighting, of course subject is going to appear darker. Compare to natural sunlight which is brighter. On top of that alot of bounce light.

Actually theres two reasons. 1) the camera can only pick up certain value ranges at a time and it will take priority over it. 2) Lighting scenarios , dude is in low artificial lighting, of course subject is going to appear darker. Compare to natural sunlight which is brighter.