%%
%% The LaTeX Companion, 3ed
%%
%% Example 3-1-19 on page I-145 in "lettrine --- Dropping your capital".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{147.0pt}
\sloppy % to fit in small book columns
\begin{filecontents}[overwrite]{myinitials.cfg}
\LettrineOptionsFor{A}{grid,loversize=.33,slope=0.6em,findent=-1em,nindent=0.6em}
\LettrineOptionsFor{I}{image,loversize=.1,lraise=-.05,findent=1pt}
\end{filecontents}

%StartShownPreambleCommands
\usepackage{tgpagella,lettrine,graphicx}
\setcounter{DefaultLines}{3}
% content of file shown above
\renewcommand\DefaultOptionsFile{myinitials.cfg}

%StopShownPreambleCommands

\begin{document}
\lettrine{I}{f your initial} does not exist as a glyph
in a font but as a graphic object (like this one) then
you can use the keyword \texttt{image} \ldots
\lettrine[ante={\makebox[0pt][l]{\hspace{5pt}``}}]
 {A}{s a result} font size used for the initial `A' is
exactly the same as the one for `À' and as \ldots ''
\end{document}