From some tests, i wonder that camera histogram is a linear scale of JPG view with 256 on the right and128 at center (-1ev). The first squater reach 64 (-3ev) ...
With Raw digger we can see a Log scale as in the "zone system" : the different scale create a compression of left part of histogram, as you say.
To see that, viez histograms of lin or log grey scales.
Linear Log
From some tests, i wonder that camera histogram is a linear scale of JPG view with 256 on the right and128 at center (-1ev). The first squater reach 64 (-3ev) ...
With Raw digger we can see a Log scale as in the "zone system" : the different scale create a compression of left part of histogram, as you say.
To see that, viez histograms of lin or log grey scales.