[Gimp-user] global color changes

First turn off the active selection: Select -> None
With such a tiny image, the chequer "transparency" pattern gets in the
way. Add a layer underneath and fill with a colour. You want that
anyway for a new background.
It is there if you look. Probably you saw some Gimp 2.8 examples, Gimp
2.10 requires the user to set transparency first. White is the default

Layer -> Transparency -> Add Alpha channel then Color -> Color to
Alpha. That menu entry is down toward the bottom.
Black lines to white lines in the layers once they have transparency.
Use Color -> Invert

some screenshot examples, https://i.imgur.com/U1hKYRa.jpg sorry this
is a bit terse, but I am packing in for the day.

rich: www.gimp-forum.net

First and foremost. Thank you for taking your valuable time to respond.  

Your answer really gave me the clue I was approaching the problem in an
inappropriate way.
I revised my approach and made huge inroads. 

I need to spend time getting ready for a hip operation.  As soon as I am done
with that I will convey what stopped me on my new approach.  I has to do with
not being able to use rectangular selection on a transparent layer.

thank you once again.  a HUGE amount of thank you.

whburling (via www.gimpusers.com/forums)

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