How to fully change a border colour in GIMP?

Question

I did the whole select colour -> fill colour thing but all the edges are frayed, how to fix this.

Also tried the colour exchange mapping, didn't work so well.

Hi. Welcome to GDSE. Have your tried increasing the threshold setting, to get a better selection? The fraying of the edges may be impossible to fix however, since you are making a selection of pixels. Ultimately, GIMP probably isn't the right kind of software for work like this. Consider using a vector image editor, such as Inkscape, which is also free. — Billy Kerr, Oct 16 '18 at 9:56

xenoid · Accepted Answer · 2018-10-16 10:02:14Z

There are several ways to clean a selection:

To remove small holes and dents in a selection, you can try Select>Grow by one/two pixels followed by Select>Shrink by the same amount.
Select>Feather followed by Select>Sharpen, or using the "quick mask" by adding contrast (which gives softer edges)
Select>To path followed directly by Select>From path (you can also edit the path in between, and remove some anchors)

For more specific recommendations, please post an extract of the original image.

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