I have a drawing that looks like the Celtic knot work above and I would like to turn this into a 3d image where the darkness changes the height of it. That would be nice! The next step would be to carve this out with a CNC machine.
I found this:
- http://am.co.za/grayscale - a gallery
- https://picto3d.com/ seems to be down
- This seems to work: https://imagetostl.com/