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I put it at the beginning of

I put it at the beginning of my question:

>I suppose that scaling consists of 5 elements: 1) linearization of curved values as far as an irreversible raw file is concerned, 2)setting of black level, 3) setting of white level, 4) subtraction of black level values from each pixel, and 5) mapping modified values to a logical range of 0-1.

In the case of dcraw, 5th element is not appropriate.