>> Any hints?
> 
> Does this help? It's approximated using the default assumed_gamma, and 
> may not be perfect, but it's a start:

I see... So a pigment function has to be colour_mapped? That would 
explain why it's not working.

Ah, but I can extract all three colour components, turn each into a 
pigment, and average them together... ingenius!

OK, I'll give that a go.

PS. I'm not using any gamma correction at all - I don't know what it is 
or how it works. So...

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