I have an img that it is a black line. I try to convert to vector: Inkscape > Path > Trace Bitmap. Even the img is just a fine line, it makes two vector lines: one for the outside border of the original shape and another for the inside border.
If I select the shape with the arrow it seems just one line. But if I select with the Edit path tool seems like two parallel lines.
Do you know how to make the vector conversion with just one line? Or perhaps, is there a way to make the two lines into one, later?
The shape is very complex, but as an example, I show you a simple circle. It has two lines and I need just one: