Extracting informations from a graphic

I’m currently working on a data processing algorithm which involve (for now) grabing values from bidimentional graphs (x;y values) by hand. It is used to do polynomial fitting. I speak about this kind of graph: enter image description here

Because the amount of data to extract from these graphics can be very huge (multiple lines with different parameters) I realised that it could be really time consuming for the user. All the graphs we have are pictures.

I would like to know if in the huge world of image processing something exist for extracting a finite number of points with their coordinates from a graph.

Thank you.

How to plot a graphic with solution of some inequality?

I defined the function $ z(n)$ by

z[n_] := Catch[Do[i; If[Mod[Fibonacci[i], n] == 0, Throw[i]], {i, 100000}]]

and now, I would like to plot the graphic (n,z(n)) for points such that $ z(n)/n<\epsilon$ , for some given value of $ \epsilon>0$ . For instance, for $ \epsilon=0.05$ , I used the command

Catch[Do[n; If[z[n] < 0.05*n, Print[n]], {n,1, 3000}]]

which provides me many values of $ n$ , but I do not know how to make a graphic with them (they appear in some collumn). Thanks in advance.

Any possibility to evaluate / calculate the threads by usage of graphic card?

Would it be possible to employ the GFX card instead of CPU, for work with threads, like it would be when the video or anything that would require high power of processing can be used?
I just bought this one for video rendering: PNY NVIDIA Quadro P4000, 8GB GDDR5.

Thanks for your answer, eventually to add it to the wishlist.

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