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diff --git a/macros/latex/contrib/elpres/elpres-manual.tex b/macros/latex/contrib/elpres/elpres-manual.tex
index 1fb50dddb6..f9357f2044 100644
--- a/macros/latex/contrib/elpres/elpres-manual.tex
+++ b/macros/latex/contrib/elpres/elpres-manual.tex
@@ -1,37 +1,61 @@
+% -*- coding:utf-8 -*-
\documentclass[11pt,a4paper]{article}
\setlength{\parskip}{0.6ex}
\setlength{\parindent}{0mm}
-\usepackage[latin1]{inputenc}
-\usepackage{textcomp}
\usepackage[a4paper,hmargin=2.4cm,bottom=3.2cm]{geometry}
-\newcommand{\hoch}[1]{\raisebox{0.6ex}{#1}}
-\newcommand{\tief}[1]{\raisebox{-0.6ex}{#1}}
\usepackage{url}
\usepackage{framed}
+\usepackage{graphicx}
\usepackage{xcolor}
+\usepackage{enumitem}
+
+\usepackage{luaotfload}
+\usepackage{fontspec}
+\setsansfont{Latin Modern Sans}
+\setmonofont{Latin Modern Mono}
+\setmainfont{Latin Modern Roman}
+
+
+%% for tth: remove "noitemsep" !!
+
+
+\usepackage[%
+ colorlinks=true%
+]{hyperref}
\title{\textsf{elpres} --- electronic presentations \\ with (pdf)\LaTeX}
\author{Volker Kiefel\thanks{volker dot kiefel at freenet dot de,
- http://vkiefel.de/elpres.html}}
-\date{v0.5\\[1.8ex]
- July 12, 2020}
+ \url{http://vkiefel.de/elpres.html}}}
+\date{v0.6\\[1.8ex]
+ August 19, 2020}
+
+
+
+
\begin{document}
\maketitle
\thispagestyle{empty}
-
+
{
-\setlength{\parskip}{0ex}
+% \setlength{\parskip}{0ex}
+ \setlength{\parskip}{0.26ex}
\tableofcontents
}
+% \clearpage
+
+\vspace{8ex}
+
\section{Introduction}
-The \textsf{elpres} class can be used for presentations on a screen, a
-beamer or projector. It is derived from \LaTeX's \texttt{article} class and
+The \textsf{elpres} class is intended to be used for
+presentations on a computer screen, a
+beamer or a projector. It is derived from \LaTeX's \texttt{article} class and
may be used with \LaTeX{}, pdf\LaTeX{} (and Lua\LaTeX ).
The default ``virtual paper size''
-of documents produced by this class: width=128mm, height=96mm corresponds to a
+of document pages
+produced by this class: width=128mm, height=96mm corresponds to a
4:3 (width:height) aspect ratio. Other aspect ratios for widescreen monitors
may be selected
by class options. The \textsf{elpres} class requires that the \texttt{ifthen},
@@ -39,19 +63,62 @@ by class options. The \textsf{elpres} class requires that the \texttt{ifthen},
\texttt{hyperref},
\texttt{graphicx},
\texttt{xcolor}
-and \texttt{geometry} packages are available on the system.
+and \texttt{geometry} packages are available on the \TeX{} system: these
+packages are loaded automatically by the \texttt{elpres} class.
Enhancements to \texttt{elpres} are easily made available by other packages,
these include overlay support for incremental slides (package
\texttt{overlays}) and slides
with a background from a bitmap (\texttt{wallpaper}, \texttt{eso-pic}
-packages).
+packages). Predefined color/layout schemes for \texttt{elpres} presentations
+can be acitivated with
+\verb+\usepackage+ (details can be found in
+in section~\ref{sec:pres-scheme})
+
+This manual is intended to support the user with ``recipes''. Use of
+\texttt{elpres} with its default settings should be simple, additional aspects
+including overlay functions, use of colors, graphics files, ``handout
+documents'' are described in section \ref{secEnhancements}. Many code snippets
+have been included in this manual.
+They can be used in users' presentation files.\footnote{To make copying easier,
+this manual is also available as \texttt{.html} document on the
+\texttt{elpres} website (\url{http://www.vkiefel.de/elpres.html})}
\section{Installation}
-Copy \texttt{elpres.cls} into a directory, where
-your \LaTeX-system can find it and update the files database\footnote{e.\,g.
-by using the \texttt{mktexlsr} or \texttt{texhash} command (TeXlive)}.
+\label{sec:installation}
+
+
+\begin{sloppypar}
+
+If the \texttt{elpres} package has already been installed with the \TeX-system
+nothing needs to be done. If an updated version shall be installed,
+\texttt{elpres.cls}, the \texttt{.sty}, \texttt{.png} and \texttt{.eps}
+files should be copied
+into a directory, where your \TeX-system can find it:
+if an old \texttt{elpres} version of the existing \TeX\ system shall be
+replaced by the current version, please copy these
+into the appropriate position in the
+``local'' \texttt{texmf} directory tree
+(e.\,g. \verb+~/texmf-local/tex/latex/elpres+) and this manual
+(\texttt{elpres-manual.pdf}) to \verb+~/texmf-local/doc/latex/elpres+.
+Then, the files database should be updated by entering (in case of a \TeX~Live
+installation) the command:
+
+\end{sloppypar}
+
+\begin{verbatim}
+ mktexlsr ~/texmf-local
+\end{verbatim}
+
+or you may enter \verb+texhash ~/texmf-local+\footnote{The location
+ for the ``local'', manually updated class and package files may be different,
+ depending on the \TeX\ system and the OS.}.
+Other \TeX-systems e.\,g.\ Mik\TeX\ have
+their own package updating mechanisms. The elpres manual file should be
+accessible with the command ``\mbox{\texttt{texdoc elpres}}''. If this
+still calls the old version of the manual, the command ``\texttt{texdoc -l elpres}''
+will prompt you to select either the old or the new version of the manual.
\section{Usage}
@@ -67,7 +134,7 @@ The class is used with
(Helvetica), \texttt{cmfont} (Computer Modern), \texttt{sansfont} (Sans
Serif: default) and \texttt{nofonts} (no font selection,
intended for use of \texttt{elpres} with Lua\LaTeX\
-with is own font selection mechanisms) are used.
+with its own font selection mechanisms) are used.
Options for different screen aspect ratios: \texttt{4x3}
(default), \texttt{16x9}, \texttt{16x10}. The option \texttt{navisymb}
adds symbols for navigation to the presentation.
@@ -76,13 +143,15 @@ Options of the \texttt{article} class are also available for
e.\,g. \texttt{10pt}, \texttt{11pt}, \texttt{12pt} for
selection of font size.
-{ \sloppy
+
\textbf{\texttt{Elpres}-specific commands}:
\verb+\distance+ vertically adjusts text on a slide.
The \verb+\auvimm+\footnote{for \textbf{au}dio \textbf{vi}deo \textbf{m}edia}
command inserts a link to an external audio or video file.
Two commands: \verb+\fromlinktext+ and \verb+\totargettext+
can be used for internal links within a presentation.
+With \verb+\slidetitlecolor+, the text color of slides (\texttt{psli})
+can be changed.
\textbf{\texttt{Elpres}-specific environments}:
@@ -90,48 +159,66 @@ the environments \texttt{psli} and \texttt{rsli} define ``slides'' in
\texttt{elpres}; \texttt{citemize}, \texttt{cenumerate} and
\texttt{cdescription} provide vertically compressed lists.
-A simple example document:
+\subsection{A minimalistic example presentation}
+
+The following code may be used for your first ``experiments'' by adding
+features described in latex sections.
\begin{verbatim}
- \documentclass[12pt,pdftex,helvetfont,4x3]{elpres}
+ \documentclass[12pt,pdftex,4x3]{elpres}
\usepackage[latin1]{inputenc}
- \usepackage{color}
\usepackage[document]{ragged2e}
- \RaggedRight
-
+
+ % \usepackage{elpreswhitebluescheme}
+ % \usepackage{elpreswhitetealscheme}
+ % \usepackage{elpresbluelightgrayscheme}
+ % \usepackage{elpresgrayscheme}
+ % \usepackage{elpreswhiteredscheme}
+ \usepackage{elpreswhitetealscheme}
+
\begin{document}
\begin{titlepage}
- \centering
- \distance{1}
- {
- \Huge \bfseries \textcolor{blue}{Title of the presentation} \par
- }
- \vspace{1.3ex} \large
- Author\\[2ex]Institution
- \distance{2}
+ \centering
+ \distance{1}
+ {
+ \Huge \bfseries \textcolor{eptitlecolor}{Title of the presentation} \par
+ }
+ \vspace{1.3ex} \large
+ Author\\[2ex]Institution
+ \distance{2}
\end{titlepage}
-
+
\begin{psli}[Title of Page]
- The first page
-
+ The first page: \texttt{psli} environment
+
\begin{itemize}
- \item first line in an itemized list
- \item second line in an itemized list
+ \item first line in an itemized list
+ \item second line in an itemized list
\end{itemize}
\end{psli}
-
+
\begin{rsli}
- The second page
+ The second page: \texttt{rsli} environment
+
+ \begin{enumerate}
+ \item no title
+ \item not centered vertically
+
+ \end{enumerate}
+
\end{rsli}
\end{document}
\end{verbatim}
+You may copy the code examples from this manual more easily from the
+\texttt{.html} version of this manual available at
+\url{http://vkiefel.de/elpres/elpres-manual.html}.
-%% Here a minimalistic example
\subsection{Essential elements of an \texttt{elpres} presentation}
-The \textbf{title page} can be created within the \texttt{titlepage} environment, the
+The \textbf{title page} slide can be created with
+the \texttt{titlepage} environment (or \texttt{rsli}, see below), \LaTeX's
\verb+\maketitle+ command is not available.
\textbf{Slides} may be created with the
\texttt{psli}-environment\footnote{\texttt{psli}: \textbf{pl}ain
@@ -216,23 +303,87 @@ Similarly, the \texttt{enumitem} package is also able to modify the
+\subsection{Slide layout: changes in slide title, footer, page numbers}
+
+\label{sec:footerlayout}
+
+By default, the \textbf{text color of the titles} of
+\texttt{psli}-slides is black,
+it may be changed by redefining the ``value'' of the \verb+\slidetitlecolor{}+
+command like
+
+\begin{verbatim}
+ \slidetitlecolor{blue}
+\end{verbatim}
+
+in the preamble. Of course, you may also use the named colors of the
+\texttt{xcolor} package (see section \ref{sec:use-colors}).
+
+By default the \textbf{page number} appears at the right bottom of the slide
+(in the ``footer'' in the terminology of the \texttt{fancyhdr} package)
+this position can be addressed by the \verb+\rfoot{}+ command: the
+\verb+\rfoot{}+, \verb+\cfoot{}+ and \verb+\lfoot{}+ commands can be used
+by the author of a presentaton.
+
+\begin{sloppypar}
+However, access to the header fields defined by \texttt{fancyhdr}
+is blocked\footnote{If you enter
+ \texttt{\textbackslash rhead}, \texttt{\textbackslash chead}
+ or \texttt{\textbackslash lhead}, \texttt{elpres} will issue
+ an error message. Use of the header fields will generate unwanted effects
+ on page layout due to \texttt{fancyhdr}.}.
+If you wish to change the position of the page number in the footer,
+you can overwrite the default page number with an ``empty'' \verb+\rfoot{}+
+command and put it to the center or the left margin of the footer
+(\verb+\cfoot{\footnotesize \thepage}+ or
+\verb+\lfoot{\footnotesize \thepage}+). These ``footer fields''
+are also suitable to enter a \textbf{logo} visible on all pages
+(in form of a graphics file using
+\verb+\includegraphics[]{}+) or text with the name of the speaker's
+institution.
+\end{sloppypar}
+
+The user may also use predefined \textbf{presentation schemes} with defined
+colors and layout elements (e.\,g. symbols used in list envoronments), details
+are described in section \ref{sec:pres-scheme}.
+
+
-\section{Enhancements to elpres}
+\section{Enhancements to \texttt{elpres}}
\label{secEnhancements}
+\subsection{Use of named colors of \texttt{xcolor}}
+\label{sec:use-colors}
+
+The \texttt{elpres} class automatically loads the \texttt{xcolor} package.
+Color related commands may therefore be used with names defined by
+\texttt{colorx}. They are however only accessible in groups
+(\texttt{dvipsnames}, \texttt{svgnames}, \texttt{x11names}). As an example,
+the color \texttt{Indigo} is available in \texttt{svgnames}. If you wish
+to use it you will have to enter \texttt{svgnames} as \texttt{elpres}
+class option:
+
+\begin{verbatim}
+ \documentclass[11pt,16x9,svgnames]{elpres}
+\end{verbatim}
+
+This option is then automatically ``handed over'' to the
+\texttt{xcolor} package.
+The complete lists of named colors are found in the \texttt{xcolor} manual.
+
+
\subsection{Include graphics files}
Graphics files/pictures can be included with the
\texttt{includegraphics}-command of the \texttt{graphicx}-package. Please be
-aware that the dimensions of the pages are 128mm \texttimes{} 96mm and
+aware that the dimensions of the pages are \mbox{128mm x 96mm} and
therefore included graphics are scaled appropriately. A safe way to generate a
page with a picture could be (with \texttt{pict.png} as the name of the
graphics file):
\label{secUsageGraph}
-
\begin{verbatim}
\usepackage[pdftex]{graphicx} % (in preamble)
...
@@ -289,8 +440,8 @@ If the contents of slides are to be made visible step
by step this can be achieved by a series of output PDF or (PS) files (carrying
the same page number) usually called \emph{overlays}. It may also be of
interest to change a highlighting color in a series of overlays. This is most
-easily done by using the \texttt{overlays} package written by Andreas Nolda
-together with \texttt{elpres}.
+easily done by using the excellent \texttt{overlays} package written by
+Andreas Nolda.
To generate a series of four overlays sequentially showing four lines of a
list:
@@ -340,6 +491,21 @@ sequentially:
\end{overlays}
\end{verbatim}
+The last example shows short text fragments which are shown sequentially using
+the \texttt{only} command:
+
+\begin{verbatim}
+ \begin{overlays}{4}
+ \begin{rsli}
+ \only{1}{a short text, which will be replaced \ldots }
+ \only{2}{\dots by a second \ldots}
+ \only{3}{\ldots and a third \ldots}
+ \only{4}{\ldots and a final text.}
+ \end{rsli}
+ \end{overlays}
+\end{verbatim}
+
+
The ``hidden'' text contents are written by \texttt{overlays} in the same
color as the background, default is white. If you use a different background
color, you have to change the color of the hidden text as well by assigning the
@@ -356,14 +522,18 @@ yellow as background:
\end{verbatim}
+
+If you use one of the \emph{presentation schemes} described in section
+\ref{sec:pres-scheme}, the necessary adjustments
+for the background color will be made automatically.
For more details on \texttt{overlays}, see the documentation of the package.
\subsection{Navigation symbols}
\label{sec:NavigationSymbols}
-With the \texttt{navisymb} option a panel with navigation symbols
-(colored in light gray) appears
+With the \texttt{navisymb} option of \texttt{elpres} a panel with navigation
+symbols appears
in the right lower corner of the presentation:\\
@@ -386,24 +556,41 @@ of the ``internal'' PDF-viewer in recent versions of the
\texttt{Firefox}-browser (Linux, Windows).
-\subsection{Call multimedia content from a presentation}
+\subsection{Run multimedia content from a presentation}
\label{sec:MultimediaContent}
-The command \verb+\auvimm{text}{media-file}+ inserts \texttt{text} with
-a link, which calls the default application for audio or video media files
-\texttt{media-file}.
-This seems to work with Adobe Acrobat Reader (Windows) and with
-\texttt{evince} (Linux).
-An example for using this command:
+The command \verb+\auvimm{text}{media-file}+ inserts \texttt{text} with a
+link (``poster''), which allows to start the default application
+for an audio or video media file
+(\texttt{media-file}). This worked flawlessly on the computers of the author of
+this manual with Adobe Acrobat Reader (Windows) and with \texttt{evince} and
+\texttt{Impress!ve}\footnote{Can be started from the terminal:
+ \texttt{impressive}} (Linux).\footnote{The \texttt{\textbackslash auvimm}
+ command uses the \texttt{\textbackslash href} command of the
+ \texttt{hyperref} package} An example for using this command:
\begin{verbatim}
\auvimm{[sound-file]}{./audiofile.mp3}
\end{verbatim}
-This produces the (text-based) ``button'' \texttt{[sound-file]}. If you
-hit it with the mouse pointer it will call the default application for
-audio files. This approach requires that you keep the presentation file
+This produces the (text-based) ``button'' or ``poster'' \texttt{[sound-file]}.
+You may also insert an image file as a poster with a graphics file using
+\texttt{\textbackslash inlcudegraphics}:
+
+\begin{verbatim}
+ \auvimm{\includegraphics{/path/to/poster.png}}{./audiofile.mp3}
+\end{verbatim}
+
+If you hit the poster with the mouse pointer it will call the default
+application for audio files. If this does not work, it may be necessary to
+write as ``launch'' command:
+
+\begin{verbatim}
+ \auvimm{[video-file]}{run:./videofile.mp4}
+\end{verbatim}
+
+This approach requires that you keep the presentation file
together with the multimedia files in the same folder, \textbf{also at
the time of
the presentation}. On an unknown computer system (where you have to show
@@ -412,14 +599,15 @@ a call to an external program might be blocked due security reasons in Acrobat
Reader.
\begin{leftbar}
-This \texttt{elpres}-command should be considered experimental.
-Its behavior depends on the pdf-reader and the configuration of the OS.
+This \texttt{\textbackslash auvimm}-command should be considered experimental.
+Its behavior depends on the pdf-viewer and the configuration of the OS.
\end{leftbar}
-\subsection{Prepare a ``handout'' from a presentation}
-\label{secHandout}
+\subsection{Prepare a ``handout'' from a presentation}
+
+\label{secHandout}
In advance of a lecture it is often expected that you
prepare a ``handout'' from your presentation with more than one
@@ -442,10 +630,12 @@ pages included.
with \texttt{in.pdf} as the initial presentation. The syntax of \texttt{gs}
is described in detail on the ghostscript
website\footnote{\url{https://www.ghostscript.com/doc/current/Use.htm}}.
-An alternative to \texttt{gs} is \texttt{pdftk} tool:
+On Windows systems the name of the ghostscript command may be
+\texttt{gswin32c.exe} or \texttt{gswin64c.exe}.
+An alternative to \texttt{gs} is the \texttt{pdftk} tool:
\begin{verbatim}
- pdftk in.pdf burst output page_%02d.pdf
+ pdftk in.pdf burst output page_%03d.pdf
\end{verbatim}
The syntax of \texttt{pdftk} is explained in the documentation
@@ -612,6 +802,258 @@ page.
Details of \texttt{eso-pic}'s commands can be found in the documentation.
+\subsection{Presentation schemes}
+
+\label{sec:pres-scheme}
+
+\texttt{Elpres} provides predefined \textbf{presentation schemes}:
+color and layout schemes which are applied to a presentation with
+\verb+usepackage{}+. Their naming follows the convention
+\mbox{\texttt{elpres...scheme}}, an
+example is \texttt{elpreswhiteredscheme}.\footnote{the name of the
+ corresponding style or package file is \texttt{elpreswhiteredscheme.sty}}
+These \texttt{elpres}-schemes also support incremental slides with the
+\texttt{overlays} package.
+Moreover, these schemes define color names
+which may be used by the author of a presentation:\footnote{Color names for use
+by the presentation author start with \texttt{ep...}}
+
+
+
+
+\begin{description}[noitemsep]
+\item[\texttt{eptextcolor}] ``normal text color'' (default values for
+ documents without
+ presentation scheme included in \texttt{elpres.cls}: black)
+\item[\texttt{ephighlightcolor}] color, which may be used for highlighting
+ text (default:
+ dark red)
+\item[\texttt{eptitlecolor}] color of the title of slides, may be used to
+ highlight the
+ title in the title slide (default: dark red)
+\end{description}
+
+Presentation schemes available in the current version of \texttt{elpres}:
+
+\begin{sloppypar}
+
+\begin{description}[noitemsep]
+
+% \item[\texttt{elpresplainscheme}] ..
+
+\item[\texttt{elpresbluelightgrayscheme}] dark blue background of slides;
+ \texttt{eptextcolor}: light gray;
+ \texttt{eptitlecolor}: turquoise;
+ \texttt{ephighlightcolor}: yellow;
+ symbols in \emph{itemize} environment: pale blue bullets;
+ highlighted elements in \emph{enumerate} and \emph{description}
+ environments: pale blue
+
+\item [\texttt{elpresgrayscheme}] gray background of slides;
+ \texttt{eptextcolor}: dark gray;
+ \texttt{eptitlecolor}:
+ dark green; \texttt{ephighlightcolor}: dark red;
+ symbols in \emph{itemize} environment: gray bullets; highlighted elements
+ in \emph{enumerate} and \emph{description} environments: dark green
+
+\item [\texttt{elpreswhitebluescheme}] white background of slides;
+ \texttt{eptextcolor}: blue-black;
+ \texttt{eptitlecolor}: blue;
+ \texttt{ephighlightcolor}: dark red;
+ symbols in \emph{itemize} environment: blue bullets; highlighted elements
+ in \emph{enumerate} and \emph{description} environments: blue
+
+\item [\texttt{elpreswhiteredscheme}] white background of slides;
+ \texttt{eptextcolor}: red/brown-black;
+ \texttt{eptitlecolor}: dark red;
+ \texttt{ephighlightcolor}: dark blue;
+ symbols in \emph{itemize} environment: red bullets;
+ highlighted elements in \emph{enumerate} and \emph{description}
+ environments: red
+
+\item [\texttt{elpreswhitetealscheme}] white background of slides;
+ \texttt{eptextcolor}: black-teal;
+ \texttt{eptitlecolor}: teal;
+ \texttt{ephighlightcolor}: dark red;
+ symbols in \emph{itemize} environment: blue bullets; highlighted elements
+ in \emph{enumerate} and \emph{description} environments: dark teal
+
+\end{description}
+\end{sloppypar}
+
+In all of these schemes, the colors of borders for internal and external
+links have been adjusted.
+
+
+% Die Farben in LibreOffice / rgb (266) / rgb (1)
+% ----------------------------------------------
+% Tango himmelblau 1 / 114 159 207 /
+% Rot 5 / 153 0 102 /
+% Grau 6 / 128 128 128 /
+
+\section{Recipes for use of \texttt{elpres}}
+\label{sec:elpres-recipes}
+
+\subsection{Colored text boxes}
+\label{sec:colored-text-boxes}
+
+Colored text boxes often help the presentation author to highlight small text
+fragments and to make slides more ``readable'' and more attractive.
+
+\subsubsection{Text boxes with \texttt{\textbackslash colorbox}, \texttt{\textbackslash fcolorbox}}
+\label{sec:simple-text-boxes}
+
+
+A simple method for colored text boxes uses the \texttt{minipage} environment
+and the \texttt{colorbox} or \texttt{fcolorbox}
+commands (\texttt{xcolor} package):
+
+\begin{verbatim}
+ \begin{psli}[Slide with a textbox]
+ \begin{center}
+ \colorbox{eptitlecolor}{\begin{minipage}{0.85\textwidth}
+ \centering \color{white} \vspace{2ex}
+ {\Large
+ Text centered in a colorbox
+ } \par
+ \vspace{2ex}
+ \end{minipage}}
+ \end{center}
+ \end{psli}
+\end{verbatim}
+
+
+\subsubsection{Text boxes with the \texttt{tcolorbox} package}
+\label{sec:tcolorbox-boxes}
+
+The \texttt{tcolorbox} package provides great support for colored boxes. A
+minimal example:
+
+\begin{verbatim}
+ \begin{psli}[Slide with a textbox]
+ \begin{tcolorbox}[colframe=eptitlecolor!95!black]
+ \textcolor{eptitlecolor}{This is a textbox generated with the
+ \texttt{tcolorbox} package}
+ \tcblower This the lower part of the tcolorbox
+ \end{tcolorbox}
+ \end{psli}
+\end{verbatim}
+
+An example with a titled colored textbox:
+
+\begin{verbatim}
+ \begin{psli}[Slide with a textbox]
+ \begin{tcolorbox}[colback=eptitlecolor!10!white,%
+ colframe=eptitlecolor!95!black,%
+ title=Heading of a textbox]
+ This is another \textbf{tcolorbox}.
+ \tcblower
+ Here, the lower part of the box.
+ \end{tcolorbox}
+ \end{psli}
+
+\end{verbatim}
+
+The manual of the \texttt{tcolorbox} provides perfect instuction for the use
+of this package.
+
+\subsection{Inactivate \texttt{overlays} commands}
+\label{sec:inact-overl-comm}
+
+\begin{sloppypar}
+If a pesentation has been prepared with overlay slides (using the
+\texttt{overlays}) package, the \LaTeX{} source code will contain
+\verb+\visible+, \verb+\only+ and \verb+\alert+ commands and
+\texttt{overlays} and \texttt{fragileoverlays} environments.
+
+Sometimes, it is desirable to generate a version of such a presentation
+without overlays effects, for example for preparation of a printed handout
+(see section \ref{secHandout}).
+The effect of these overlay-specific instuctions can be
+inactivated with this series of commands:
+\end{sloppypar}
+
+
+\begin{verbatim}
+ \renewenvironment{overlays}[1]{}{}%
+ \renewenvironment{fragileoverlays}[1]{}{}%
+ \renewcommand{\visible}[2]{#2}%
+ \renewcommand{\only}[2]{#2}%
+ \renewcommand{\alert}[2]{#2}%
+\end{verbatim}
+
+which should be copied or entered in the preamble following
+\verb+\usepackage{overlays}+.
+
+
+\subsection{Convert an \texttt{elpres}-presentation (PDF) into an Impress (LibreOffice) or Powerpoint presentation}
+\label{sec:convert-into-libreoff}
+
+Sometimes it is unclear, if organizers of a (scientific) meeting allow
+presentations with pdf-files but insist on files in Powerpoint format. This is
+an unpleasant situation, but sometimes it is better to be prepared.
+
+There is no elegant way for a reliable solution.
+First, you may use one of the free or commercial online conversion
+tools (intended to convert \texttt{.pdf} into
+\texttt{.ppt} or \texttt{.pptx}-files). Results are often not satisfactory.
+
+An alternative, more reliable way preferred
+by the author of this manual (although a little awkward) is:
+
+
+\begin{enumerate}
+\item convert the pdf-file of the presentation into a series of bitmap
+ graphics files, (e.\,g. in \texttt{.png} format)
+\item import these image \texttt{.png} files into pages of an empty Impress
+ (LibreOffice or OpenOffice) presentation and save the presentation in
+ \texttt{.ppt} or \texttt{.pptx}-Format
+\end{enumerate}
+
+\textbf{Details on step 1 --- generate \texttt{.png} images:}
+
+Please copy the following command (ignoring the line-break) into a single line
+at the terminal command prompt or copy them into one line of a short shell
+script (Windows: a \texttt{.bat} file) and ``run'' or execute the shell
+script:
+
+\begin{verbatim}
+ gs -dNOPAUSE -dBATCH -sDEVICE=png256 -r300
+ -sOutputFile=page_%03d.png input.pdf
+\end{verbatim}
+
+\begin{sloppypar}
+ Please do not forget to adjust the name of the input file
+ \texttt{input.pdf}. This command generates a series of \texttt{.png}-files
+ \texttt{page\_001.png}, \texttt{page\_002.png} ... \texttt{page\_0nn.png}.
+ On Windows systems the name of the ghostscript command is
+ \texttt{gswin32c} or \texttt{gswin64c}.
+\end{sloppypar}
+
+If you wish a better resolution of the \texttt{.png} change \texttt{-r300} to
+\texttt{-r600} or even \texttt{-r1200}:
+
+\begin{verbatim}
+ gs -dNOPAUSE -dBATCH -sDEVICE=png256 -r600
+ -dTextAlphaBits=4 -sOutputFile=page_%03d.png input.pdf
+\end{verbatim}
+
+The additional option \texttt{-dTextAlphaBits=4} improves font
+antialiasing.\footnote{Details can be found in the docume3ntation of gs
+ \url{https://www.ghostscript.com/doc/current/Use.htm}}
+
+\textbf{Details on step 2 --- Import \texttt{.png} images:}
+
+Open an empty presentation with LibreOffice Impress, adjust the appropriate
+slide format (e.\,g. 4:3), import the first \texttt{.png} file with
+\emph{Insert~/ Image}, then adjust the size of the included image with
+\emph{Format~/ Object~and~Shape~/ Position~and~Size (F4)} in the
+\emph{Position~and~Size} dialog box please enter: \emph{Postion~X}:
+\texttt{0.0cm}, \emph{Postion~Y}: \texttt{0.0cm}, \emph{Width}:
+\texttt{28.0cm}, activate the checkbox \emph{Keep~ratio}.\footnote{Menu
+ structure of LibreOffice v6.3}. The presentation can now be saved
+in one of the Microsoft Powerpoint formats \texttt{.ppt} or \texttt{.pptx}.
+
\section{License}
This class is distributed under the \textsl{\LaTeX{} Project Public License}
@@ -653,8 +1095,18 @@ symbols for navigation), new commands: \verb+auvimm+ (generates
a link to external audio, video files), \verb+\fromlinktext+ and
\verb+\totargettext+ (create links within a presentation).
Documentation has been partly rewritten.
+\textbf{v0.6} (19.08.2020):
+Access to the \texttt{fancyhdr} ``header fields'' (\verb+\lhead{}+,
+\verb+\chead{}+ and \verb+\rhead{}+) is now explicitly blocked.
+New command \verb+\slidetitlecolor{}+ for the text color of titles in
+\texttt{psli}-slides.
+New: style files for presentation schemes added.
+Documentation has been significantly
+completed: sections \ref{sec:footerlayout},
+\ref{sec:use-colors}, \ref{sec:pres-scheme} and \ref{sec:elpres-recipes} added,
+section \ref{sec:installation} on installation rewritten.
+
\end{document}
-% vim:spell:fileencoding=latin1:lines=55: