One thing you need to watch out for when animating stamps with many layers is making sure no part of any of these layers fall outside the stamp border, otherwise they will appear outside the fringed area of the stamp. In Fireworks, you can make a layer set as 'erase' - so it removes everything to the background colour where there are pixels on this layer. You can probably do the same in Ps too.
Yeah, I guess a group mask would work just as well. Using a bitmap set to erase everything below it is the easiest way to do things in Fw but I would expect the process to be very different in Ps, as too is animation.
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