Use Lua. \def\eval#1{\ctxlua{% local context = context local _ENV = math context(#1) }} \definecolor[mycolor][r=\eval{0.5*0.7}] \starttext \color[mycolor]{Hello!} \stoptext On 18/02/19 4:37 PM, Mohammad Hossein Bateni wrote:
Hi,
When I use definecolor, (how) can I use computations in setting the value of a component? Something like the following...
\definecolor[mycolor][r=0.5*0.7]
Thanks, ~MHB
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