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make lines thicker on already drawn object
I have several objects that are already drawn. After finishing them, I think they need to have thicker lines. Is there a way to make this so, without having to redraw the objects with a thicker line in the pencil or path tool?

I'm using GIMP 2.10 on linux.
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)




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.

That did the trick. I am curious about the Threshold and Levels tools, but that's academic at this point. Thank you for the information. The steps in your explanation were helpful.
This is awesome! It's exactly what I needed to know, so thank you very much. Using the Paths tool for thickening lines is so time-consuming and tedious and this worked perfectly.

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