Perspective Tool

[rich2005]

Quote:...After adjusting one side, I try to adjust the other side but the first one moves.

I tried always to reproduce that, but can only get one handle moving.

Edit: After looking at the video again, Is the problem that the handles are outside the points you really aim at transforming? Adjusting the 'shape' of the transform moves everything inside the grid.

Try this video, see if your procedures/settings differ. 2 and a half minutes duration.






shows
1. Perspective transform on the canvas
2. Perspective transform on a selection
3. Perspective transform - backward mode

edit: ...or are you trying to do something like this https://www.gimp-forum.net/Thread-4-poin...0qX90S6_70
that uses a plug-in but can be done by transforming a selection.
If you wait for Gimp 2.10 (or try Gimp 2.9.5) there is a new 'handle-transform' tool which allows you to select 4 points and drag around to deform