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Convert outlined stroke to single stroke


Question

Recently I've been messing with Illustrator/Inkscape and trying to convert something like this:

outlined stroke

to a single-stroked path like this:

single-stroke

I've searched a lot and I haven't found a solution.

2017/01/05
1
6
1/5/2017 12:53:00 AM

Accepted Answer

Offset Path

(Object → Path → Offset Path...)

If you know the original stroke weight, offset by half that stroke weight (In my example here, the stroke was 10pt. A 5pt offset was too much due to the slight stroke variations on the curves but 4.999pt was ok). If you don't know the original stoke weight it's easy enough to zoom in and increase the offset by eye.

Offset Path Options

The offset path will leave you with a closed shape so you will need to manually delete one 'side' of that shape—just zoom in and delete the points you don't need. The ends will be offset too, so extend the path as much as needed then delete the original path.

Path result from Offset Path


Blend

If the original stroke had a varied width, offset path won't help you much. Another solution is to use Blend.

Path with varied stroke width

First delete both end sections of the outlined stroke (or use the scissors tool to cut each end). This will give you 2 separate paths.

Path sections to delete

Set the blend options to specific steps and 1 step (Object → Blend → Blend Options). With both paths selected create your blend (Object → Blend → Make).

Blend Options

Expand the blend (Object → Blend → Expand) and delete the original paths.

Path from expanded blend

The Blend technique is the same as this answer, which goes in to more detail.

2017/04/13
3
4/13/2017 12:46:00 PM