That wasn’ t exactly what i expected but thanks to you i get it:

    \definefont[BigFontOne][Regular sa 3]
    \definefont[BigFontTwo][RegularBold sa 2] 

    \definecolor[BigColorOne][r=.86,g=.850,b=.54]
    \definecolor[BigColorTwo][r=.43,g=.425,b=.27]

    \def\ChapterCommand#1%
         {\doChapterCommand#1\end}

     \def\doChapterCommand#1#2\end
          {\rlap{\BigFontOne\BigColorOne#1}\kern15pt#1#2}


     \setuphead[chapter]
     [deeptextcommand=\ChapterCommand,
                        color=BigColorTwo,
                        style=\BigFontTwo]
     ]


Date: Sat, 15 May 2010 20:28:28 +0200
From: schuster.wolfgang@googlemail.com
To: ntg-context@ntg.nl
Subject: Re: [NTG-context] Chapter headers variation

Am 15.05.10 20:24, schrieb pol stra:
Maybe this could be done by modify t-lettrine.tex and use a lettrine in the header ?

untested:

\def\ChapterCommand#1%
  {\doChapterCommand#1\end}

\def\doChapterCommand#1#2\end
  {{\red #1}#2}


\setuphead[chapter][deeptextcommand=\ChapterCommand]


Wolfgang



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