Patrick Dupre <pdupre <at> gmx.com> writes:

> > > 
> > > I cannot have a centered picture in overprint (beamer) environment!
> > > Is there a tips?
> > > 
> > Centered horizontally or centered vertically?
> > 
> Horizontally

Works for me if I surround it with a parbox. I'm attaching a small example
(using one of the LyX icons as the graphic).

Paul

#LyX 2.1 created this file. For more info see http://www.lyx.org/
\lyxformat 474
\begin_document
\begin_header
\textclass beamer
\use_default_options true
\maintain_unincluded_children false
\language english
\language_package default
\inputencoding auto
\fontencoding global
\font_roman default
\font_sans default
\font_typewriter default
\font_math auto
\font_default_family default
\use_non_tex_fonts false
\font_sc false
\font_osf false
\font_sf_scale 100
\font_tt_scale 100
\graphics default
\default_output_format default
\output_sync 0
\bibtex_command default
\index_command default
\paperfontsize default
\spacing single
\use_hyperref false
\papersize letterpaper
\use_geometry true
\use_package amsmath 1
\use_package amssymb 1
\use_package cancel 1
\use_package esint 1
\use_package mathdots 1
\use_package mathtools 1
\use_package mhchem 1
\use_package stackrel 1
\use_package stmaryrd 1
\use_package undertilde 1
\cite_engine basic
\cite_engine_type default
\biblio_style plain
\use_bibtopic false
\use_indices false
\paperorientation portrait
\suppress_date false
\justification true
\use_refstyle 1
\index Index
\shortcut idx
\color #008000
\end_index
\leftmargin 1in
\topmargin 1in
\rightmargin 1in
\bottommargin 1in
\secnumdepth 3
\tocdepth 3
\paragraph_separation skip
\defskip smallskip
\quotes_language english
\papercolumns 1
\papersides 1
\paperpagestyle default
\tracking_changes false
\output_changes false
\html_math_output 0
\html_css_as_file 0
\html_be_strict false
\end_header

\begin_body

\begin_layout Frame
\begin_inset Argument 4
status open

\begin_layout Plain Layout
Frame with Graphic Overprint
\end_layout

\end_inset


\begin_inset Argument 3
status open

\begin_layout Plain Layout
<+->
\end_layout

\end_inset


\end_layout

\begin_deeper
\begin_layout Itemize
A
\end_layout

\begin_layout Itemize
B
\end_layout

\begin_layout Overprint
\begin_inset Argument item:1
status open

\begin_layout Plain Layout
2
\end_layout

\end_inset


\begin_inset Box Frameless
position "t"
hor_pos "c"
has_inner_box 1
inner_pos "t"
use_parbox 1
use_makebox 0
width "100col%"
special "none"
height "1in"
height_special "totalheight"
status open

\begin_layout Plain Layout
\noindent
\align center
\begin_inset Graphics
        filename /usr/share/lyx/images/unknown.png

\end_inset


\end_layout

\end_inset


\end_layout

\begin_layout Itemize
C
\end_layout

\end_deeper
\end_body
\end_document

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