I am new to reading digital photo histograms. I've been told that the
horizontal scale of luminosity is logarithmic. That the histogram is
divided into 8 segments (not visually differentiated) of equal width.
The first segment at the right side contains twice the information as
the next segment, and that segment contains twice the info as its
neighbor to the left, and so on. Meaning that the distribution image
isn't quite what it might appear at first glance, its being on a
logrithmic rather than linear scale. Apparently, the advantage of a
log scale is that since the dark (left) end of the histogram
represents images with far fewer photons, a linear scale histogram
would be pretty thin on that end. Can anyone direct me to a better
explanation of this? One that doesn't have a degree in physics as a
prerequisite?