OK, I was half watching TV so not much saved. Some clues as to procedure.
You can colour select one of the colours. That will Copy then Paste -> As a new image.
It has a transparent background so removing the alpha channel leaves colour on white.
Edit -> Generic -> Dilate grows the coloured line. A couple of times to give a reasonable size.
A bit of hand painting repair for any missing sections.
Colors -> Color-to-Alpha removes the white background.
In linux I can drag that from Gimp into Inkscape. Otherwise export as a png and open in Inkscape.
In Inkscape, I can centerline trace (one path per section of line) the image.
Save that as a svg file then in Gimp right click in the paths dock to import the path. Stroke or fill as required.
You can colour select one of the colours. That will Copy then Paste -> As a new image.
It has a transparent background so removing the alpha channel leaves colour on white.
Edit -> Generic -> Dilate grows the coloured line. A couple of times to give a reasonable size.
A bit of hand painting repair for any missing sections.
Colors -> Color-to-Alpha removes the white background.
In linux I can drag that from Gimp into Inkscape. Otherwise export as a png and open in Inkscape.
In Inkscape, I can centerline trace (one path per section of line) the image.
Save that as a svg file then in Gimp right click in the paths dock to import the path. Stroke or fill as required.