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2. To make a border create a new layer, be sure this layer is transparent and "on top" of all the other layers. This makes the border you will draw on this layer be visible on all frames in one quick easy step. Then draw your border either by hand or with this method dukesucks taught me.
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Hmm. I can't figure out how to do this in GIMP. I make a new transparent layer, select all, shrink the selection by 1 pixel, invert the selection, then fill the selection. I just can't figure out how to get that layer "on top" of all other layers. The best I can do is to duplicate that layer a bunch, then merge one copy of it with each frame layer, which is tedious and annoying. :|
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You are really close. Just make that layer "visible" on every "frame" of the animation. It should be easy to do. You need the little eye icon to be visible for each frame. In imageready I can do this easy by just selecting the first "frame" and turning the eye icon (it is near the border layer) off and on. All changes to the first frame of an animation are normally duplicated to all frames. Sorry I can't explain it better.
Here is an animation of the idea. See how the border shows up on each frame when I click the eye icon. When i make changes to the first frame the changes are copied to all the frames. It puts my border layer on top of all the frames.