1 \section{Nuances of
\Index{transparency
}}
3 The key value
\texttt{\Lkeyword{opacity
}=$k$
} with $k
\in \mathbb{R
}$ and $
0\leq
4 k
\leq 1$, allows you to define the level of
\Index{opacity
}.
6 Within
\textit{jps code
}, we use an equivalent expression
7 \texttt{$k$ setfillopacity
}. The last expression finds its application in the option
\Lkeyword{fcol
}. For example the instruction,
8 \verb+fcol=
0 (
.5 setfillopacity yellow)+,
9 which defines the face with the index number
0, sets it to yellow with an opacity of
50\%.