I've got a rectangle selection. Now, I am trying to do a subtractive
selection within that rectangular selection, to make a sort of picture frame
selection. The problem is that I'm having trouble getting the inner,
substractive selection centered within the first rectangle.
When I use the ctrl key while selecting, it grows a rectangle and I can't
figure out where to start the growth so it is centered. Very hard to do.
When I try to use the tool settings dialog to push the subtractive selection
option, the selection doesn't even seem to work?
Gimp 2.2.13, Debian linux
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