make lines thicker on already drawn object

[Ofnuts]

(03-19-2021, 03:01 PM)Zorpheus Wrote:

(12-31-2019, 04:39 PM)Gully Wrote: I have several objects that are already drawn. After finishing them, I think they need to have thicker lines. Is there a way to make this so, without having to redraw the objects with a thicker line in the pencil or path tool?

I'm using GIMP 2.10 on linux.

I found an even better solution:
"Select -> By Color" to select the black lines
"Select -> Grow" to widen the selection
Set the background color to the line color wanted, remove alpha channel, and press delete.

This is very artificial, and you would get the same result by bucket-filling the selection with the color. If the layer isn't opaque all over, the alpha channel is precious, don't delete it if you can avoid it.