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advice sought for program with GUI

I'm not very good at this stuff, have remembered bits here and there.
Memory seems no so good these days.
I've done pieces of simple calculations on 2D images in the past but when I go back and look at them think " now what does that do and what did I type to make it work". I'm thinking that if I do something now I should make a little GUI with buttons to click on that are self explanatory.
I know nothing about that.
Is that Gtk or ncurses or something ?
pointers to what's needed appreciated.


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