\externalfigure has a "color" parameter. It used to be possible to colorize
greyscale pictures with that, but it doesn’t work any more:
%%%
\setupcolors[state=start]
\setupexternalfigures[
location={local,global,default},
]
\starttext
\externalfigure[img/minidodo_g][width=.3\textwidth,color=red] % greyscale
\externalfigure[img/minidodo_b][width=.3\textwidth,color=green] % bitmap
\externalfigure[cow][width=.3\textwidth,color=blue] % vector
\stoptext
%%%
Greetlings, Hraban
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