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It appears to be working this time. Quite resource intensive though, I had no idea it'd take so long. It ran 100% load for 10 minutes before finishing (after clicking OK in the settings). I believe I'd changed Interpolation to Range-Kutta but changed nothing else. The picture was 3348x4429.

Neat though. I'll have to fiddle with it more!

Edit: Selecting "nearest" instead of "range-kutta" is much much faster.