How can I digitize scanned sketches similar to how Preview's signature feature does? When you use Preview's feature to use the Mac's camera to scan your signature for later insertion into documents, it does a fantastic job of digitizing your written piece so that it is rendered smoothly, I assume as vector, not raster.

I need that same feature for other uses, to scan sketches and work on them digitally.

But, of course, using the little signature feature in Preview does not work for most of them!

How can I utilize that same "scan-a-sketch-into-clean-vector-form" feature in a way other than using Preview's signature app?

THANKS --eric
You might want to try Vector Magic, it did very helpful turning my sketches into vector. It needs to be scanned first. We can adjust how detail the vector output.