With \definecolor[colorname][r=,g=,b=] one defines a color of name "colorname"
for use in ConTeXt and in Metapost.
A transparentcolor comes with \definecolor[transparentcolorname][r=,g=,b=,a=,t=]
Problem: how to define a transparent color with
\definetransparentcolor[#1][#2][#3]{...}.
To be called for example as
\definetransparentcolor[transparentcolorname][colorname][0.5] for color
"colorname" with transparency 0.5.
I tried to do this by intercepting from \definecolor the vales "r=,g=,b=" in a
macro \colornamergb to be called as \csname..\endcsname for the varying
colorname and feeding that to a definecolor-variant. However, the parsing of
r=,g=,b= then goes wrong (\futurelet balking).
Question: is there a direct way to derive a transparent colorvariant from a
parent one without transparency? The usefulness of this comes from the fact
that for things like \definecolor[lighthoneydew][r=.894117,g=.95,b=.894117] the
numbers need not be feed more than once.
Hans van der Meer
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