> Am 06.05.2024 um 10:41 schrieb Hans van der Meer via ntg-context 
> <ntg-context@ntg.nl>:
> 
> I would like to use a transparent version of an existing color. Thus
> \definecolor[transparentcolor][color,t=0.2,a=1]
> instead of
> \definecolor[transparentcolor][r=..,g=..,b=..,t=0.2,a=1]
> because I do not know the rgb values of the color that must be made 
> transparent, only its name.
> 
> How to accomplish? 

I think like this:

\definecolor[myred][r=.5]
\defineprocesscolor[myredish][myred][a=1,t=.2]
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