I'm seeking for a tool that can convert a PNG image like this:
To an SVG border outline like this:
I'm not sure whether the creator of this image traced the outline by hand. He used GIMP to create the image.
Oh, I already found out by this article. It uses GIMP.
Open the image you want to edit and use the select tools to remove parts of the image until you get the shape that you want to produce with your SVG path:
Next use the magic wand to select all the areas that you just cut out.
Now go to the Invert item from the Select menu.
This will make the selection tool take the shape of the painted area, as opposed to the transparent area. Now choose To Path from the Select menu.
In the Paths window, you will see a path has been created (it should be called Selection. Right click on the path and choose Export Path
Save the path on the filesystem.