2D picture with relief: how to select deep ends?

[rich2005]

This is tracing the design using paths. A bit on the long side, 9 minutes but nothing like other y-t makers. https://youtu.be/kxvjUjo3AD8





For a neon type effect, Ofnuts plugin is in http://sourceforge.net/projects/gimp-pat...s/scripts/  neon-path-0.2.py  dated 2016-11-09  Not shown in the video or try this one see: https://www.gimp-forum.net/Thread-ofn-gr...along-path

Edit: Forgot to mention:
In the view menu turn snap-to-guides off.
Make a mistake, ctrl-z (undo) is your friend, true for all the tools but especially paths.