Michael Gerz wrote:
> After some (short) investigation, I came to the conclusion that using
> the colors defined within LyX is not that trivial.

Why? Look at shadecolor (in LaTeXFeatures.cpp) for a model.
Something like (untested):

        RGBColor c = RGBColor(lcolor.getX11Name(Color::strikeout));
        packages << "\\providecolor{lyxdeleted}{rgb}{" 
                << c.r/255 << ',' << c.g/255 << ',' << c.b/255 << "}\n";

        RGBColor c = RGBColor(lcolor.getX11Name(Color::newtext));
        packages << "\\providecolor{lyxinserted}{rgb}{" 
                << c.r/255 << ',' << c.g/255 << ',' << c.b/255 << "}\n";

should be sufficient.

Jürgen

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