Okay, so I'm trying to make an animated .gif but the images are too dark. I created an image sequence from a .mov file using Quicktime, then opened the image sequence in GIMP using the "Open as layers" option (I'm using GIMP 2.6.6 on Mac OSX 10.4.11, if it matters). I upped the brightness on a few of the layers and I like how it turned out, but I don't want to have to do that manually for 163 layers! Is there a way to apply the increased brightness effect to all of the layers at once, instead of changing it one at a time? ???