Affecting color (specifically exposure) on multiple layers at once?

[Ofnuts]

(08-29-2021, 07:17 PM)Speusippus Wrote: I want to change the exposure on like 20 layers all at once. I thought the "layer group" feature should be the thing to use, but when I group all these layers together, all "color" options are greyed out when I select the group. I'm still only able to affect one layer at a time.

Is there any other GIMP feature that will help me do this instead?

If the layers are all the same size (elements of an animation) put all the layers in a single "sprite sheet" that you edit, and then split the sprite sheet back to layers. See for instance my ofn-layer-tiles script for the layers ⬌ sprite sheet transforms.