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I suggest, to avoid lots of fiddly grainy detail, applying a gaussian blur to the image before the threshold filter as this blurs out a lot of the fine detail.
My usual solution: let Google decide!
Pillaging: about 787,000 results
Pilliging: about 1,440 results
Well, at least Google didn't catch it as a misspelling, but it looks like you're being outvoted more than 500-to-1 (plus by all the dictionaries I checked)...