You may disable automatic brightening and use manual exposure shift (exp_correc, exp_shift, exp_preser parameters). The exact amount of shift will differ on different cameras/different ISO values (see, for example, this article: https://photographylife.com/adobes-silent-exposure-compensation )
'not exposed normally' means that graypoint value is below 18% by some amount.
You may disable automatic brightening and use manual exposure shift (exp_correc, exp_shift, exp_preser parameters). The exact amount of shift will differ on different cameras/different ISO values (see, for example, this article: https://photographylife.com/adobes-silent-exposure-compensation )
'not exposed normally' means that graypoint value is below 18% by some amount.