Doug,
Actually, you don't need a filter to do high pass. All you need is Gaussian Blur and Invert:
1. Copy the original layer into a separate layer
2. Place the copy layer over the original
3. Blur the copy layer using Gaussian Blur
4. Invert the copy layer
5. Set the transparency of the copy layer to 50%
Voila!
High pass filter?
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There is also an excellent article about the High Pass on Gamasutra:
http://www.gamasutra.com/features/20010523/hajba_01.htm
http://www.gamasutra.com/features/20010523/hajba_01.htm