Change background

[Blighty]

1. Make sure the image has an alpha channel
Layer > Transparency > Add Alpha Channel

2. Make a selection on the TV
(see selection tools below)

3. Invert the selection
Select > Invert

4. Delete the background
Edit > Clear

5. Create a new layer below the TV. Fill with required colour.

6. Save as .xcf    Export in required format

https://docs.gimp.org/en/gimp-tools-selection.html
https://www.gimp-forum.net/Thread-Painle...tion-tools