On Tue, 12 Jan 2010, Ben wrote:

Dear List, using the pgf build from 20100103 and texlive2009 from the Debian unstable I've just tried to do the following:

\enableregime[utf] \usemodule[tikz]

\starttext

\startTEXpage \pgfutil@definecolor{magenta}{rgb}{1,0,1}

\starttikzpicture \draw (0,0) -- (1,1); \stoptikzpicture \stopTEXpage

\stoptext

I always get

! Undefined control sequence. l.21 \pgfutil @definecolor{magenta}{rgb}{1,0,1} ? ! Emergency stop. l.21 \pgfutil @definecolor{magenta}{rgb}{1,0,1} End of file on the terminal!

You need to add \unprotect and \protect \unprotect \pgfutil@definecolor{...} \protect They are similar to \makeatletter and \makeatother in LaTeX. The correct way is to ConTeXt's color mechanism to define colors. For example, \usemodule[tikz] \definecolor[mycolor][r=1,g=0,b=1] \starttext \starttikzpicture \node[text=mycolor] {Test} ; \stoptikzpicture \stoptext This works with MkII but gives an error with MkIV. ! Undefined control sequence. \pgfutil@registercolor ...ef \pgf@temp {\PDFcolor {#1}}\edef \pgf@marshal {\... \pgfutil@colorlet ...x \pgfutil@registercolor {#2} \fi \edef \pgf@marshal {\n... \tikz@next ...futil@colorlet {.}{\tikz@textcolor } \fi \pgfsetcolor {.}\setbo... l.7 \node[text=mycolor] { Test} That is because MkII and MkIV have a different color model, and tikz does not support the MkIV model yet. I am attaching a fix for that. I do not know what is the best way to incorporate it into tikz (perhaps a pgfutils-mkiv.tex file). For the moment, you can just input it after loading tikz. Aditya