i guess we'll have to live with the workaround then..
Too bad.. I really hoped there was like a way to change to the tool to pencil automatically before the script runs so you don't have to like remember that extra step.

Your script text as viewed in notepad doesn't say anything about using the pencil to draw the line for the resulting selection. I just wanted to let you know about that. I don't suppose it could be because I have set up my shortcut for the pencil tool to L.

it doesn't it strokes path using the active brush. I don't think there is a solid line stroke path function, it just uses the active brush.
I just set brush to be hardbrush 100 and pixel width 1 and antialias OFF.

I don't know how to draw a solid line using active brush, and there is no way to stroke a path with the pencil tool.
So i found a workaround using threshold 64, 255, it some times selects 2 pixel wide on some parts on lines when there is curve... but generally it's a thin selection still.
Give this a try.

I get messages but the line seems to be only 1 pixel. I pasted the error box in the screen shot of the quick mask view.



Is there a way to use the stroke path. Or maybe that's what your trying already?

those are just messages, they're not errors so it's okay.
This version doesn't show messages.


There isn't a way to tell Gimp to switch tool to pencil because it runs script.
And there isn't away to call stroke path with solid line, all i can do is stroke using the active brush, and i don't know how to set the brush in such a way that it would behave like the pencil..I tried all sorts of context setting things. If you know a way how to get this single pixel line without using the GUI stroke line but with the stroke with paint tool and paint brush... I don't even see away to switch the tool...but it can only use active brush.

I recall Ofnuts doing something similar (I think) using a path. Which would take you into Python territory.

well hopefully offnuts will chime in.

I FOUND something, on the internet that allows to draw a path using .svg and then i load the mask as selection it actually selects a 1 pixel wide path that isn't cut off at certain sections when i tested.

here's the update.
You'll need an add an additional .py file into your plug-ins folder.


Then update the .scm file with this.


I think it's pretty tight now. Test it and let me know how it goes. (Note: while it's working it'll save a temporary .svg file to your gimp's tmp folder and then delete it right afterwards).

There is something i missed even though it worked as loading selection one pixel wide, but the drawing wasn't crispy, it had half transparent pixels around it.

There is an extra option in svg that i just added called shape-rendering="crispEdges".

This version actually draws a 1pixel wide fully opaque (you won't be able to tell the difference from previous version but it's there and more correct just so we have this in the future, we can do more with it less chances of it being buggy).

extract .py and put in/overwrite previous in plug-ins folder


overwrite previous .scm file in scripts folder

This one produces a selection that is off center when I try to use it over or next to the layer boundary edges. I'll just use the first one. I just hit the shortcut for pencil and then the shortcut for the script. It works great. Thanks!

I think that might be solved with this one. We must solve it...We MUST I don't like that you have to remember to switch to a certain tool before running a script.

I solved by making the canvas size 5 times the original so that the path is always inside it.
Create a blank new layer and work on this new layer.
Once I have the selection.
Turn canvas size back to original, delete the new layer created and set active layer to the original layer.

to go along with the previous .py file.

There's all kinds of work arounds I guess. This works fantastic. I've got a pretty fast computer so 5 times bigger is good. Could probably get away with 3 times bigger but you never know if I might need it that big one day.

That's what i like to hear...