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?
yours sincerely
dr. Hans van der Meer