Histogram of image pixel intensities and the density of a particular intensity

What I am trying to do:


What I able to do as of now:

I know the layout thing,pls help with the fraction part
how to make that line that tells fraction of representation of a particular intensity in whole spectrum…

If this isn’t a homework question, see

https://juliaimages.org/latest/democards/examples/spatial_transformation/histogram_equalization/#Histogram-equalisation

If it is, you shouldn’t look, because it’s the exact answer and you’ll lose out by not figuring it out on your own. Instead, read the documentation for https://github.com/JuliaImages/ImageContrastAdjustment.jl

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