[NTG-context] Can I turn images to grayscale with a ConTeXt command?

Gerben Wierda Gerben.Wierda at rna.nl
Thu Oct 2 19:52:33 CEST 2014

I have a few images that are in colour. But in the output I want them in grayscale. Is it possible to manipulate a graphic like that from within ConTeXt?

I’m using mkii



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