xcolor=x11names statt xcolor=dvipsnames
\usepackage{/usr/share/texmf/tex/latex/beamer/themes/color/BeamerColor} auskommentiert
\usecolortheme[named=firebrick]{structure}
und
\setbeamercolor{background canvas}{bg=seashell}
gesetzt, mal Firebrick und mal firebrick, mal seashell, mal Seashell
und bekomme jedesmal die Meldung:
/usr/share/texmf/tex/latex/beamer/themes/color/beamercolorthemestructure.sty:20:Package xcolor Error: Undefined color 'firebrick' \ProcessOptionsBeamer
gleichzeitig wird in einem Tabulator die Datei 'beamercolorthemestructure.sty' geöffnet, welche bei mir folgenden Inhalt aufweist:
% Copyright 2007 by Till Tantau % % This file may be distributed and/or modified % % 1. under the LaTeX Project Public License and/or % 2. under the GNU Public License. % % See the file doc/licenses/LICENSE for more details. \ProvidesPackageRCS $Header: /cvsroot/latex-beamer/latex-beamer/themes/color/beamercolorthemestructure.sty,v 1.4 2007/01/28 20:48:24 tantau Exp $ \DeclareOptionBeamer{gray}{\definecolor{beamer@structure@color}{gray}{#1}} \DeclareOptionBeamer{rgb}{\definecolor{beamer@structure@color}{rgb}{#1}} \DeclareOptionBeamer{RGB}{\definecolor{beamer@structure@color}{RGB}{#1}} \DeclareOptionBeamer{cmyk}{\definecolor{beamer@structure@color}{cmyk}{#1}} \DeclareOptionBeamer{cmy}{\definecolor{beamer@structure@color}{cmy}{#1}} \DeclareOptionBeamer{named}{\definecolor{beamer@structure@color}{named}{#1}} \DeclareOptionBeamer{hsb}{\definecolor{beamer@structure@color}{hsb}{#1}} \ProcessOptionsBeamer \setbeamercolor{structure}{fg=beamer@structure@color}
best regards,
hans1967