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@pedr I think it has to do with the gradient. The graph goes from 0-255 and I suspect that the gradient isn't as linear because it may not be that aesthetically pleasing or near the ends it takes more solid to give the pure black or pure white appearance.
@Pedr pretty much it. It's more useful to know if the distribution of pixels leans brighter/darker/etc than to know exactly how many pixels are bright/dark/etc. Therefore the scale is not important, only how much higher/lower one part of the graph is compared to the others.
@JohnSmith you would have to map one folder to another specifically, which could be quite intensive depending on how different your structures are. If the differences are limited to the top of the tree it'd be easier than if they're different all the way to the lowest level folder.
