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Yes I know: I wrote

Yes I know: I wrote “understand” instead of “guess”, because I was trying to fix the thing in one time, instead of by instalments . Then:
I’ve read that a raw file stores exposition (E) values linearly, and that a GAMMA function can be applied to them during raw conversion in order to increase the range of pixel values in the lower zones of exposition. This last result can be achieved if E values have not yet been rounded to nearest integers, otherwise the GAMMA application adds no information about these zones. As a first step, could you tell whether or not you agree on this point?