Re: latex beamer preamble.

[Herbert Voss]

Bo Peng wrote:

Lyx inserts

\usepackage[usenames]{color}

this is superfluous, beamer loads by default xcolor.
Options to xcolor can be passed via the class options
Layout->Document->Layout->Options

So \usepackage{color} should not be inserted at all. I tried to add

yes, shouldn't be part of the internal preamble

options "pdftex,usenames" for beamer but still get the 'option clash

why do you need the pdftex option? It could be detected
by nearly all packages itself. And beamer itself passes it
to hyperref

use "dvipsnames,xcolor" as class options


Herbert