Colour by numbers

The principle of "colouring by numbers" is simple:
You are given a set of numbered points, connecting them with lines in the right order (follow the numbers in ascending order) will result in an image.

I challenge you to take an arbitrary (png) image of black lines on white background and converting it to
the named set of points. (And maybe including a mechanism that does the connecting-thing for you, too 😁 )

Variations/Extensions to this could be these:
The user could draw a shape which will then be transformed. (Like done in the fourier-transform-series)

An other way of interpreting the name "colour by numbers" is the following:
You are given a black-and-white image with contours and small sections with numbers in them. The task is to fill each section with the colour corresponding to the number (a legend has to be given)
Transforming a RGB (png) image into this kind of task would be a nice challenge, too.
And here as well, "auto-completion" would be very nice! 😄

La issue non indica alcun file del repository, test o punto di ingresso. Per prima cosa scegli quale interpretazione proposta seguire: punti numerati provenienti da PNG con linee nere, forme disegnate dall’utente o regioni di colore numerate; quindi definisci input, output e comportamento al completamento prima di individuare il punto di ingresso rilevante per l’elaborazione delle immagini.