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RAW conversion

Many thanks. From your answer, I understand that a camera applies the “GAMMA” function (with gamma 2.2, I suppose) to the inside-registered exposure values and converts them to integer numbers. No common user of a common digital camera can access the original exposure values in order to apply a different gamma and enhance the number of pixel levels in a low-exposure zone. Is this right? And does it also apply to any user, and any camera?