make lines thicker on already drawn object

[vespa6]

(12-31-2019, 05:37 PM)Ofnuts Wrote: If you used the path tool, it's only a matter of re-stroking with a wider line.

Otherwise, starting with this;



Apply a Gaussian blur:



Start the Curves tool, and make a diagonal across the white part on the right (which is the histogram of your blurred image)



Result:



The trick being to find the position/slope of the diagonal which is the best compromise between smoothness and blurriness.
You can use the Threshold tool instead (but you will have jagged edges)(Threshold is just Curves with a vertical drop). You can also use Levels.

Can someone please explain this in a bit more detail, I have tried and cant get it to work - Im new to gimp, still learning, thank you