On Mon, 24 Aug 2009, Derek CORDEIRO wrote:

I'm no expert, but this seems to work:

\setupcolors [state=start, system=rgb]

\def\bw#1{\framed[background=color,backgroundcolor=black]{\color[white]{#1}}}

Slightly more ConTeXtish

\defineframed
  [WhiteOnBlack]
  [background=color,backgroundcolor=black,foregroundcolor=white]

(I also tend to avoid small lowercase command names, as you could inadvertenly redefine a build-in context macro)

\setuppagenumbering[command=\bw,location={header,margin}]
\starttext
\input tufte
\stoptext

Aditya
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