Ct scan greys

[jakubMitura14]

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Hello I am trying to create colorscheme that I want to use in the heatmap of makie for now I use greys and It works quite well but

I would like to implement windows so pixels below given value a should be black all above given value b should be white different shades of grey for all values between a and b and proportional to those values

How to achieve this?

Thank you for help!

Below What Is already achieved but without windows

[cormullion]

Hi Jakub! Assuming you can pass in normalised values from 0 to 1 in Makie, you can do this with ColorSchemeTools.jl:

using ColorSchemes, ColorSchemeTools

function f(n, a, b)
    if n < a
        return 0
    elseif n > b
        return 1
    else
        return ColorSchemes.remap(n, a, b, 0, 1)
    end
end

a = 0.3
b = 0.8

newscheme = make_colorscheme(n -> f(n, a, b), n -> f(n, a, b), n -> f(n, a, b), 
    length=100,
    category = " ... ",
    notes    = " ... ")

[jakubMitura14]

Thanks !