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Deadtech -
I can't answer the PS question, I use GIMP.
Power of 2: this is the "2 raised to the n" stuff I tried real hard to forget after high school. Basically, how many times do you muliplty 2 times itself.
So, 2 to the power of 2 would be 2 x 2; 2 to the power of 3 would be 2 x 2 x 2; 2 to the power of 4 would be 2 x 2 x 2 x 2; etc
Cairenn gives some of the sequence above: 2, 4, 8, 16, 32, 64, 128, 256, etc
Hope that answers the question
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