There’s an error in the docs, it seems, because only the methods bw() and grayscale() seem to work, but not greyscale()like in the example.
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Love it when I open a can of worms…
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I fixed the docs, that was a funny one anyway with a mix of greyscale/grayscale that makes it so super clear that there is definitely a problem:
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Great job - thanks, just a tiny tweak I guess, but it helps to clarify and stop others falling into the pit 
This will be fixed in 3.3.3, RC1 already available for testing.
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