> The leftmost mark of the scale is the level that corresponds to the value of “1” in the RAW data.
The leftmost mark is the left wall; it is where the value in raw is equal to 1.
> The histogram step on the horizontal axis is 0.1EV, so there will always be a “comb” in the shadows, as there are less possible levels than 10 levels per stop.
In raw, say it is 14-bit raw, there are maximum 16383 levels from shadows to highlights. The first stop in highlights contains half of those, up to 8191; next stop contains half of what is in the first stop, 4095; following stops contain respectively 2047, 1023, 511, ..., and finally, the last three stops contain 7, 3, 1 level respectively. This progression simply means that the exposure in each next stop is half of what it is in the previous, brighter, stop. If the step is 0.1 EV, to fill a stop one needs at least 10 levels; with only 7 levels you will see gaps, and histogram starts to look as a comb.
If something in the above is unclear, please say so and we will try to explain better.
Dear Sir:
Dear Sir:
Let's try to approach things step by step.
> The leftmost mark of the scale is the level that corresponds to the value of “1” in the RAW data.
The leftmost mark is the left wall; it is where the value in raw is equal to 1.
> The histogram step on the horizontal axis is 0.1EV, so there will always be a “comb” in the shadows, as there are less possible levels than 10 levels per stop.
In raw, say it is 14-bit raw, there are maximum 16383 levels from shadows to highlights. The first stop in highlights contains half of those, up to 8191; next stop contains half of what is in the first stop, 4095; following stops contain respectively 2047, 1023, 511, ..., and finally, the last three stops contain 7, 3, 1 level respectively. This progression simply means that the exposure in each next stop is half of what it is in the previous, brighter, stop. If the step is 0.1 EV, to fill a stop one needs at least 10 levels; with only 7 levels you will see gaps, and histogram starts to look as a comb.
If something in the above is unclear, please say so and we will try to explain better.