The camera sensor reacts to the light falling on it in a very basic way - 'linear'. The more light, the stronger the response, at exactly the same rate, from dark to very bright. Both eyes and film 'compress' the way they receive light in such a way that ''twice as bright', seems less than it really is. This is valuable because it means that our eyesight can cope easily with a wide range of brightness, film to a lesser extent does the same.
This is not the same for the camera sensor. This is because the camera performs some quite strong processing before the result is first seen.
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