Two hurdles, (1) MacOS and (2) Gimp 2.8
There is a batch plugin BIMP https://alessandrofrancesconi.it/projects/bimp/ that does have a MacOS version but I am not at all sure that it works with Gimp 2.8 Not too easy to use for a perspective adjustment either. ...so......what you can try.
Open as layers
Link all the layers together, see: https://docs.gimp.org/2.8/en/gimp-image-...pts-layers There is a bit there about linking layers.
Apply the perspective transform tool
Now you have to export the layers as single images. If you have more than two or three layers then the attached script should work, even on a Mac.
Before starting work on your images, download and put export-layers-plus.scm in (and this might be different on your installation) /Users/MyName/Library/Application Support/Gimp/2.8/scripts.
edit: Ooops ,, forgot to attach the script - sorry
Now after you have done the perspective adjustments, It is File -> Export Layers.
There is a batch plugin BIMP https://alessandrofrancesconi.it/projects/bimp/ that does have a MacOS version but I am not at all sure that it works with Gimp 2.8 Not too easy to use for a perspective adjustment either. ...so......what you can try.
Open as layers
Link all the layers together, see: https://docs.gimp.org/2.8/en/gimp-image-...pts-layers There is a bit there about linking layers.
Apply the perspective transform tool
Now you have to export the layers as single images. If you have more than two or three layers then the attached script should work, even on a Mac.
Before starting work on your images, download and put export-layers-plus.scm in (and this might be different on your installation) /Users/MyName/Library/Application Support/Gimp/2.8/scripts.
edit: Ooops ,, forgot to attach the script - sorry
Now after you have done the perspective adjustments, It is File -> Export Layers.