Gimp transparent background invert

User description

For gimp background invert 10 images found by accurate search and more added by similar match. How to make image background transparent using gimp, how to unlock the alpha channel lock in gimp, transparent background revisited. Gimp transparent background invert.

692 x 390 131 0
340 x 192 98 0
1067 x 877 56 0
692 x 390 83 0
340 x 192 23 0
340 x 192 25 0
692 x 390 42 0
692 x 390 30 0
400 x 391 21 0
520 x 388 24 0