Have to confess, I do not really get-it from your description. The light border usually occurs with a fuzzy select around a shape on a light coloured background. A border of semi-transparent light pixels (anti-aliasing) remains. The fix for this is shrink the selection to exclude the border before copy / paste.
How did you make your initial selection and from where ?
From what is given:
I made a temporary duplicate layer so I can see the edge https://i.imgur.com/8s7V5x4.jpg
Into the original layer with the selection https://i.imgur.com/7z29Tq0.jpg
Copy / paste back in. https://i.imgur.com/3xF4Etp.jpg - but dark background on dark background so any stray pixels not showing
If you give a few more details then you will get a better answer
There is also this advice https://www.gimp-forum.net/Thread-Backgr...r-graphics
How did you make your initial selection and from where ?
From what is given:
I made a temporary duplicate layer so I can see the edge https://i.imgur.com/8s7V5x4.jpg
Into the original layer with the selection https://i.imgur.com/7z29Tq0.jpg
Copy / paste back in. https://i.imgur.com/3xF4Etp.jpg - but dark background on dark background so any stray pixels not showing
If you give a few more details then you will get a better answer
There is also this advice https://www.gimp-forum.net/Thread-Backgr...r-graphics