Hi, I've been trying to get colors to work in TikZ, and found a nice fix by Aditya here: http://archive.contextgarden.net/message/20100120.220124.f2d3f8bc.en.html The problem is that the lua script doesn't work: I get a problem with 'colors'. LuaTeX error <main ctx instance>:13: attempt to index global 'colors' (a nil value) stack traceback: <main ctx instance>:13: in function 'registercolor' <main ctx instance>:1: in main chunk. The input file from Aditya (called colorfix.tex) is \startluacode pgfutil = pgfutil or { } local texsprint, format = tex.sprint, string.format local prtcatcodes = tex.prtcatcodes function pgfutil.unsupported_color(name) texsprint(prtcatcodes,format("\\PackageError{pgf}{color %s has unsupported model}{}", name)) texsprint(prtcatcodes,format("\\pgfutil@definecolor{%s}{gray}{0}", name)) end function pgfutil.registercolor(name, attributes) print(name, attributes) local cv = colors.value(attributes) if cv then local model = cv[1] if model == 1 then print("model=1") texsprint(prtcatcodes,format("\\pgfutil@definecolor{%s}{gray}{% 1.3f}", name, cv[2])) elseif model == 3 then print("model=2") texsprint(prtcatcodes,format("\\pgfutil@definecolor{%s}{rgb}{% 1.3f,%1.3f,%1.3f}", name, cv[3], cv[4], cv[5])) else print("no model") pgfutil.unsupported_color(name) end else print("no color") pgfutil.unsupported_color(name) end end \stopluacode \unprotect \def\pgfutil@registercolor#1% {\ctxlua{pgfutil.registercolor("#1",\thecolorattribute {#1})}} \protect and my test file is \usemodule[tikz] \input colorfix \definecolor[mycolor][r=1,g=0,b=1] \starttext \starttikzpicture \fill[mycolor] (0,0) circle (1); \stoptikzpicture \stoptext I'm running the latest beta.