First thanks for the responses, but BIMP doesn't work for me. I tried installing the MacOS version using the installer script that comes with the package, and it did actually install it, nut according to their web site 'You will find "Batch Image Manipulation..." inside the "File" menu.' Except I didn't, nor did I find it under any of the other menus. And I have no idea why, unless the version of BIMP on their site is incompatible with GIMP 2.10.14. And I downloaded it from https://github.com/alessandrofrancesconi...cos.tar.gz, which appears to be the correct download link on the page at https://github.com/alessandrofrancesconi...s/tag/v2.6 so I just have no idea why it won't show up in my "File" menu.
EDIT: It was incompatible with 2.10.14, apparently. Upgrading to 2.10.24 (the latest MacOS version) allowed it to show up in the "File" menu. Now I just have to figure out how to use it!
EDIT 2: Well it sort of works - the "Zealous Crop" actually does work, but if I also try to apply a slight bit of gaussian blur then it produces files that contain no image at all for some reason, and if I use selective gaussian blur then it creates files with blocky colored lines in them. But it does do the thing I really wanted, so thanks much!
EDIT: It was incompatible with 2.10.14, apparently. Upgrading to 2.10.24 (the latest MacOS version) allowed it to show up in the "File" menu. Now I just have to figure out how to use it!
EDIT 2: Well it sort of works - the "Zealous Crop" actually does work, but if I also try to apply a slight bit of gaussian blur then it produces files that contain no image at all for some reason, and if I use selective gaussian blur then it creates files with blocky colored lines in them. But it does do the thing I really wanted, so thanks much!