08-19-2017, 02:33 PM
You didn't say how you created the rectangles. I'm guessing that you made a selection and then stroked the selection.
Stroking a selection and stroking a path use different algorithms. The path one would work better in this case.
Do Selection > To Path
In the Paths tab make the path visible and active.
Then Edit > Stroke Path
Having said all this:
Gimp is a bitmap (raster) editor. I don't know what your cards will look like. But maybe a vector editor (Inkscape) would be better.
Stroking a selection and stroking a path use different algorithms. The path one would work better in this case.
Do Selection > To Path
In the Paths tab make the path visible and active.
Then Edit > Stroke Path
Having said all this:
Gimp is a bitmap (raster) editor. I don't know what your cards will look like. But maybe a vector editor (Inkscape) would be better.