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thecoalman - 5:42 am on Oct 15, 2007 (gmt 0)
Another method is to scale them in steps using bi-cubic. Use Neat Image in between steps to clean out the fuzziness.
Do a search for genuine fractals, its a photoshop plug in specifically for scaling images up. Bi-cubic works but it "undefines" the edges. that software searches for edges and preserves them quite nicely.