I have only just begun to use GIMP but met a problem which must be simple to resolve- but not for me !
I have a photo which I wish to have a plain white border on it.
Accessing via Filters Decor, Add border, if I use the defaul blue, it works fine and give a border round all four edges. If I change the colour to white the border is onlt on the top and left. The right and bottom being a grey colour.
What am I doing wrong please ?