Thanks. Looks different from what I tried. I will look into it when I am less tired.
Update: it works!
BTW, what does l[] mean? I recall asking about e versus e[] before… is this related to that?
I have been struggling to figure out a good way to thin, centre and refine edges (of the gradient norm result). E.g., when I do
gmic sample tiger gradient_norm
I believe there are two things going on (correct me if I am wrong):
1. Brighter where there are edges.
2. Wider where edges are sharper.