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diff --git a/tex/context/base/attr-col.mkiv b/tex/context/base/attr-col.mkiv
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+%D \module
+%D   [       file=attr-col,
+%D        version=2007.06.06,
+%D          title=\CONTEXT\ Attribute Macros,
+%D       subtitle=Color,
+%D         author=Hans Hagen,
+%D           date=\currentdate,
+%D      copyright=PRAGMA-ADE]
+%C
+%C This module is part of the \CONTEXT\ macro||package and is
+%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
+%C details.
+
+\writestatus{loading}{ConTeXt Attribute Macros / Color}
+
+\registerctxluafile{attr-col}{1.001}
+
+\unprotect
+
+% todo: no need for 'color' argument, we can set that once at startup; currently
+% a bit inconsistent
+
+% 1=off  2=gray  3=spot  4=rgb  5=cmyk  6=cmy % only 1/2/4/5 are supported
+%
+% We could combine this in one attribute but this is not faster and also
+% less flexible because sometimes we want to freeze the attribute bit.
+%
+% Watch out: real color support will be implemented later.
+
+\newcount\currentcolormodel
+
+\def\dosetcolormodel#1%
+  {\currentcolormodel\ctxlua{tex.print(_clib_.setmodel('#1'))}%
+   \attribute\colormodelattribute\currentcolormodel}
+
+\dosetcolormodel{all}
+
+\appendtoks
+    \dosetcolormodel{all}% redundant?
+\to \everyjob
+
+\def\registerrgbcolor   #1#2#3#4{\ctxlua{_clib_.register('#1','rgb' ,#2,#3,#4)}}
+\def\registercmykcolor#1#2#3#4#5{\ctxlua{_clib_.register('#1','cmyk',#2,#3,#4,#5)}}
+\def\registergraycolor      #1#2{\ctxlua{_clib_.register('#1','gray',#2)}}
+
+% transparency
+
+\def\registertransparency#1#2#3%
+  {\setevalue{(ts:#1)}{\attribute\transparencyattribute\ctxlua{tex.write(_tlib_.register(#2,#3))} }}
+
+\def\sometransparencyswitch#1{\csname(ts:#1)\endcsname}
+
+\def\sometransparencyswitch
+  {\ctxlua{_tlib_.enable()}%
+   \gdef\sometransparencyswitch##1{\csname(ts:##1)\endcsname}%
+   \sometransparencyswitch}
+
+% \registertransparency {one} {1} {.5}
+% \registertransparency {two} {1} {.6}
+
+% overprint
+
+\def\registercolorintent#1#2%
+  {\setevalue{(os:#1)}{\attribute\colorintentattribute\ctxlua{tex.write(attributes.colorintents.register('#2'))} }}
+
+\def\dotriggercolorintent
+  {\ctxlua{attributes.colorintents.enable()}%
+   \gdef\dotriggercolorintent##1{\csname(os:##1)\endcsname}%
+   \dotriggercolorintent}
+
+\registercolorintent{knockout} {knockout}
+\registercolorintent{overprint}{overprint}
+
+\installattributestack\colorintentattribute
+
+\setevalue{(os:#\v!none}{\attribute\colorintentattribute\attributeunsetvalue} % does this work out ok?
+
+\protect \endinput
+
+% test case
+%
+% {\green \hbox to \hsize{\leaders\hrule  \hfill a}\par}
+% {\red   \hbox to \hsize{\leaders\hbox{x}\hfill a}\par}