%
% Copyright (C) 2015-2019 Javier Bezos http://www.texnia.com
%
% This file may be distributed and/or modified under the conditions of
% the MIT License. A version can be found at the end of this file.
%
% Repository: https://github.com/jbezos/colorspace
%

\ProvidesPackage{colorspace}[2019/03/25 v1.3 PDF color spaces]

\edef\spc@savedcatcodes{%
  \catcode`\noexpand\/=\the\catcode`\/
  \catcode`\noexpand\&=\the\catcode`\& % & is 'other' here!
  \catcode`\noexpand\<=\the\catcode`\<
  \catcode`\noexpand\>=\the\catcode`\>}
\catcode`\/=12
\catcode`\>=12
\catcode`\<=12
\catcode`\&=11 % we use it in macro names

% pdftex vs luatex compatibility

\ifx\pdfextension\@undefined
  \let\spc@Pageresources\pdfpageresources
  \let\spc@Obj\pdfobj
  \let\spc@Lastobj\pdflastobj
  \let\spc@Colorstack\pdfcolorstack
  \let\spc@Colorstackinit\pdfcolorstackinit
\else
  \edef\spc@Pageresources{\pdfvariable pageresources}
  \protected\def\spc@Obj{\pdfextension obj }
  \protected\def\spc@Lastobj{\numexpr\pdffeedback lastobj\relax}
  \protected\def\spc@Colorstack{\pdfextension colorstack}
  \def\spc@Colorstackinit{\pdffeedback colorstackinit}
\fi

\def\spc@unknown#1#2{%
  \@ifundefined{#1}%
    {\PackageError{colorspace}{Unknown #2}%
     {You haven't defined it or perhaps you misspelled it.}}%
    {}}

\@ifundefined{XC@sdef}{\RequirePackage{xcolor}}{}

\long\def\spc@afterfi#1\fi{\fi#1}
% Trim spaces in strings and normalize to single spaces
\def\spc@spaces#1 #2{%
  #1\ifx\@empty#2\else\spc@afterfi\spc@spaces@i{#1}#2\fi}
\def\spc@spaces@i#1{%
  \ifx\\#1\\\else\space\fi\spc@spaces}
\def\spc@dospaces#1{%
  \edef#1{#1\space}%
  \edef#1{\expandafter\spc@spaces#1\@empty}}

% Define a pseudo-model for spot colors. We need define the following
% 3 macros:

\XC@sdef\XC@mod@&spot{&spot}
\def\color@&spot#1#2{%
  \ifx\spc@ir\@undefined
    \expandafter\spc@getref\current@color\@@
  \fi
  \c@lor@arg{#2}%
  \edef#1{\spc@ir\space cs \spc@ir\space CS #2 sc #2 SC}}
\def\XC@clr@&spot@white{0}

% A somewhat dirty hack for converting cmyk to spot. The internal
% format is {}{/&Color cs /&Color CS n sc n SC}{spot}{n}, where n=1 is
% a tint of 100%. The original CMYK values are stored in
% \spc@ascmyk@<name>.

\def\spc@cmyktospot#1#2{%
  \begingroup
    \def\spc@tempc##1 ##2 ##3 ##4 k##5\@@{##1 ##2 ##3 ##4}%
    \def\xcolor@##1##2##3##4{%
      \expandafter\protected@xdef\csname\string\color@#1\endcsname{%
        \noexpand\xcolor@{##1}{/&#2 cs /&#2 CS 1 sc 1 SC}{&spot}{1}}%
      \xdef\spc@tempa{\spc@tempc##2\@@}%
      \expandafter\xdef\csname spc@ascmyk@#1\endcsname{##4}}%
    \csname\string\color@#1\endcsname
  \endgroup}

% The internal PDF name (which is like the public one with a &
% prepended) is available in the first argument of \xcolor@. The
% following macros extract it. 

\def\spc@getir#1{%
  \begingroup
    \def\xcolor@##1##2##3##4{\spc@getref##2\@@}%
    \@nameuse{#1}%
  \endgroup}
\def\spc@getref#1 #2\@@{\gdef\spc@ir{#1}}

% We need to redefine an xcolor macro for the tint operator ! to be
% recognized. It's done in a more modular way than xcolor:

\def\spc@infl@cmyk{\let\spc@inflcommas\@empty}% 4 values=4-4 commas
\def\spc@infl@gray{\def\spc@inflcommas{,,,}}% 1 value=4-1 commas
\def\spc@infl@&spot{%
  \spc@getir{\string\color@\@@nam}%
  \def\spc@inflcommas{,,,}}% 

\def\XC@inflate#1#2#3#4{%
  \def\spc@inflcommas{,}%      Assume 3 values=4-3 commas
  \@nameuse{spc@infl@\@@mod}%
  \edef#4{#2,\spc@inflcommas#3\spc@inflcommas}}

% The following macro stores all spot colors, with the LaTeX name. It
% also stores other color spaces. Internally is an \spc@elt list.

\let\spc@csall\@empty

% Now the main command for defining spot colors. \spc@ir@<latex-name>
% contains {/&Spot X 0 R}

\newcommand\definespotcolor[2]{\protected@edef\spc@tempa{{#1}{#2}}\spc@defsc}
\newcommand\spc@defsc[2][cmyk]{\expandafter\spc@defsc@i\spc@tempa{#1}{#2}}

\def\spc@splitbar#1#2#3/#4\@nil{%
  \def#1{#3}%
  \def#2{#4}}

\let\spc@lab@values\relax

\@namedef{spc@opt@alt=lab}#1{%
  \@expandtwoargs\in@{/}{#1}%
  \ifin@
    \spc@splitbar\spc@lab@values\spc@the@cmyk#1\@nil
  \else
    \def\spc@lab@values{#1}%
    \def\spc@the@cmyk{0,0,0,0}% dummy
  \fi
  \def\spc@tempd##1,{% comma -> space
    \ifx\@empty##1\else##1 \expandafter\spc@tempd\fi}%
  \edef\spc@lab@values{\expandafter\spc@tempd\spc@lab@values,\@empty,}}

\def\spc@defsc@i#1#2#3#4{%
  \def\spc@tempc##1 ##2{% Converts spaces to #20
    ##1%
    \ifx\@empty##2\else
      \ifx\\##1\\\string####20\else\string####20\fi
      \spc@afterfi\spc@tempc##2%
    \fi}%
  \edef\spc@tempb{\spc@tempc#2 \@empty}% Apply to convert
  \def\spc@elt##1##2{%
    \@expandtwoargs\in@{/&\spc@tempb\space}{\@nameuse{spc@ir@##2}}%
    \ifin@
      \PackageError{colorspace}{Duplicated spot name `#2'}%
        {This spot name was taken by `##2'.}%
    \fi}
  \spc@csall
  \@ifundefined{spc@opt@\zap@space#3 \@empty}%
    {\definecolor{#1}{cmyk:#3}{#4}}%
    {\@nameuse{spc@opt@\zap@space#3 \@empty}{#4}%
     \definecolor{#1}{cmyk}{\spc@the@cmyk}}%
  \expandafter\spc@cmyktospot{#1}\spc@tempb % Convert cmyk > spot  
  \ifx\spc@lab@values\relax
    \immediate\spc@Obj{[ /Separation /\spc@tempb\space
      /DeviceCMYK << /FunctionType 2 /Domain [0 1]
      /C0 [0 0 0 0] /C1 [\spc@tempa] /N 1 >> ]}% pdf separation
  \else
    \immediate\spc@Obj{[ /Separation /\spc@tempb\space
      \spc@illum@ref << /FunctionType 2 /Domain [0 1]
      /Range[0 100 -128 127 -128 127]
      /C0 [100 0 0] /C1 [\spc@lab@values] /N 1 >> ]}% pdf separation
    \global\let\spc@lab@values\relax
  \fi
  \expandafter\xdef\csname spc@ir@#1\endcsname{%
    /&\spc@tempb\space\the\spc@Lastobj\space 0 R}% save ref to obj
  \let\spc@elt\relax
  \xdef\spc@csall{\spc@csall\spc@elt2{#1}}}

% The pgf stuff *must* go before \resetpagecolorspace
\AtBeginDocument{%
  \ifx\spc@csall\@empty\else % ie, if spot/iccbased colors only
    \ifx\pgf@sys@pgf@resource@list@colorspaces\@undefined\else
      \def\spc@everycs{\pgf@sys@pgf@resource@list@colorspaces}%
      \edef\spc@tempa{% Remove pgf "static" ColorSpace 
        \noexpand\spc@remcs\the\spc@Pageresources
        \noexpand\spc@remcs{\pgf@sys@pdf@colrospaces@objnum}}%
      \spc@tempa
    \fi
    \resetpagecolorspace
  \fi}

% Options for illuminants:

\def\spc@illum@obj#1{%
  \immediate\spc@Obj{[ /Lab
    << /WhitePoint [#1] /Range [-128 127 -128 127] >> ]}%
  \xdef\spc@illum@ref{\the\spc@Lastobj\space 0 R }}

% 1931, 2-degree observer. c is deprecated

\DeclareOption{illuminant=a}{\spc@illum@obj{1.0985 1 0.3558}}
\DeclareOption{illuminant=c}{\spc@illum@obj{0.9807 1 1.1822}}
\DeclareOption{illuminant=e}{\spc@illum@obj{1 1 1}}
\DeclareOption{illuminant=d50}{\spc@illum@obj{0.9642 1 0.8251}} 
\DeclareOption{illuminant=d55}{\spc@illum@obj{0.9568 1 0.9214}}
\DeclareOption{illuminant=d65}{\spc@illum@obj{0.9504 1 1.0888}}
\DeclareOption{illuminant=d75}{\spc@illum@obj{0.9497 1 1.2261}}

% Page color spaces. The arrays mapping the spot colors to the obj
% refs are saved into the pdf as objects, and then we also save its
% reference for later recovery. Well, \pdfpageresources is not
% exactly "programmer"-friendy. We add the /ColorSpace, but if we
% switch from a previoss one, the latter must be removed, too. This
% is what \spc@remcs does. We also make sure a color space is
% defined once: first we rebuild the argument without spaces and
% then form the macro name using the order in csall, which is
% fixed. The macro name is built with the PDF names.

\let\spc@currcs\@empty
\let\spc@cs@\@empty

\let\spc@everycs\@empty

\newcommand\pagecolorspace[1]{%
  \protected@edef\spc@tempa{{#1}}%
  \expandafter\spc@pagecs\spc@tempa}

\def\spc@pagecs#1{%
  \ifx\spc@currcs\@empty\else
    \edef\spc@tempa{%
      \noexpand\spc@remcs\the\spc@Pageresources
      \noexpand\spc@remcs{\spc@currcs}}%
    \spc@tempa
  \fi
  \let\spc@tempd\@empty % list with known spaces
  \@for\spc@tempa:=#1\do{%
    \ifx\spc@tempa\@empty\else
      \spc@dospaces\spc@tempa
      \spc@unknown{spc@ir@\spc@tempa}{color (space) `\spc@tempa'}%
      \edef\spc@tempd{,\spc@tempd,\spc@tempa,}%
    \fi}%
  \let\spc@tempb\@empty % elements in /ColorSpace
  \let\spc@tempc\@empty % name for macro (\..&..&) with pdf ref
  \def\spc@elt##1##2{%
    \@expandtwoargs\in@{,##2,}{\spc@tempd}%
    \ifin@
      \protected@edef\spc@tempb{%
        \spc@tempb\@nameuse{spc@ir@##2}\space}%
      \protected@edef\spc@tempc{%
        \spc@tempc\@nameuse{spc@ir@##2}&}%
    \fi}%
  \spc@csall % Uses \spc@elt
  \@ifundefined{spc@cs@\spc@tempc}%
    {\immediate\spc@Obj{<< \spc@everycs\space\spc@tempb>>}%
     \expandafter\xdef\csname spc@cs@\spc@tempc\endcsname{\the\spc@Lastobj}}%
    {}%
  \expandafter\let\expandafter\spc@currcs\csname spc@cs@\spc@tempc\endcsname
  \ifx\spc@currcs\@empty\else
    \edef\spc@tempa{\spc@Pageresources{%
      \the\spc@Pageresources\space/ColorSpace \@nameuse{spc@cs@\spc@tempc} 0 R}}%
    \spc@tempa
  \fi}

\newcommand\resetpagecolorspace{%
  \def\spc@elt##1##2{\ifnum##1>1 ##2,\fi}%
  \edef\spc@tempa{{\spc@csall}}%
  \expandafter\pagecolorspace\spc@tempa}

\def\spc@remcs#1\spc@remcs#2{%
  \def\spc@tempc##1 /ColorSpace #2 ##2 R##3\spc@tempc{%
    \spc@Pageresources{##1##3}}%
  \spc@tempc#1\spc@tempc}

% Support for pgf (I hope--)

\def\pgfsys@color@&spot@stroke#1{%
  \spc@getir{\string\color@pgfstrokecolor}%
  \pgfsysprotocol@literal{\spc@ir\space CS}%
  \pgfsysprotocol@literal{#1 SC}}
\def\pgfsys@color@&spot@fill#1{%
  \spc@getir{\string\color@pgffillcolor}%
  \pgfsysprotocol@literal{\spc@ir\space cs}%
  \pgfsysprotocol@literal{#1 sc}}
\def\pgfsys@color@&spot#1{%
  \pgfsys@color@&spot@stroke{#1}%
  \pgfsys@color@&spot@fill{#1}}

% ==== Mixed colors ====

% xspace assumes color models have 1, 3 or 4 components. We need
% modify a couple of macros, but we'll do it only if a 2-component
% space is defined:

\def\spc@twocomps{%
  \let\spc@twocomps\relax
  \gdef\XC@vec##1,##2,##3,##4,##5,##6,##7,##8,##9{%
    \def\@@tmp{}%
    \XC@vec@{##1}{##5}%
    \ifx,##2,\else\XC@vec@{##2}{##6}%
    \ifx,##3,\else\XC@vec@{##3}{##7}%
    \ifx,##4,\else\XC@vec@{##4}{##8}%
    \fi\fi\fi
    \aftergroupdef##9\@@tmp}%
  \gdef\XC@calc@##1,##2,##3,##4,##5:##6{%
    \XC@let@Nc\@@cmd{XC@calc##6}%
    \@@cmd{##1}\@@tmp
    \ifx,##2,%
    \else\@@cmd{##2}\@tempa
    \ifx,##3,\edef\@@tmp{\@@tmp,\@tempa}%
    \else\@@cmd{##3}\@tempb
    \ifx,##4,\edef\@@tmp{\@@tmp,\@tempa,\@tempb}%
    \else\@@cmd{##4}\@tempc\edef\@@tmp{\@@tmp,\@tempa,\@tempb,\@tempc}%
    \fi\fi\fi}}

% The following macros define models with 1 to 4 components. It's
% written with the "copypaste" pattern, so it should be
% improved. Here, the limitations of xcolor become aparent, because
% 5 components would require "-1" commas.

\def\spc@mix@i#1#2{%
  \expandafter\XC@sdef\csname XC@mod@#1\endcsname{#1}%
  \@namedef{color@#1}##1##2{\@nameuse{c@lor@@#1}##2\@@##1}%
  \@namedef{c@lor@@#1}##1\@@##2{%
    \c@lor@arg{##1}%
    \edef##2{#2 cs #2 CS ##1 scn ##1 SCN}}%
  \@namedef{XC@clr@#1@white}{0}%
  \@namedef{spc@infl@#1}{\def\spc@inflcommas{,,,}}} % 1 value  = 4 - 1 commas

\def\spc@mix@ii#1#2{%
  \expandafter\XC@sdef\csname XC@mod@#1\endcsname{#1}%
  \@namedef{color@#1}##1##2{\@nameuse{c@lor@@#1}##2\@@##1}%
  \@namedef{c@lor@@#1}##1,##2\@@##3{%
    \c@lor@arg{##1}%
    \c@lor@arg{##2}%
    \edef##3{#2 cs #2 CS ##1 ##2 scn ##1 ##2 SCN}}%
  \@namedef{XC@clr@#1@white}{0,0}%
  \@namedef{spc@infl@#1}{\def\spc@inflcommas{,,}}} % 2 values  = 4 - 2 commas

\def\spc@mix@iii#1#2{%
  \expandafter\XC@sdef\csname XC@mod@#1\endcsname{#1}%
  \@namedef{color@#1}##1##2{\@nameuse{c@lor@@#1}##2\@@##1}%
  \@namedef{c@lor@@#1}##1,##2,##3\@@##4{%
    \c@lor@arg{##1}%
    \c@lor@arg{##2}%
    \c@lor@arg{##3}%
    \edef##4{#2 cs #2 CS ##1 ##2 ##3 scn ##1 ##2 ##3 SCN}}%
  \@namedef{XC@clr@#1@white}{0,0,0}%
  \@namedef{spc@infl@#1}{\def\spc@inflcommas{,}}} % 3 values  = 4 - 1 commas

\def\spc@mix@iv#1#2{%
  \expandafter\XC@sdef\csname XC@mod@#1\endcsname{#1}%
  \@namedef{color@#1}##1##2{\@nameuse{c@lor@@#1}##2\@@##1}%
  \@namedef{c@lor@@#1}##1,##2,##3,##4\@@##5{%
    \c@lor@arg{##1}%
    \c@lor@arg{##2}%
    \c@lor@arg{##3}%
    \c@lor@arg{##4}%
    \edef##5{#2 cs #2 CS ##1 ##2 ##3 ##4 scn ##1 ##2 ##3 ##4 SCN}}%
  \@namedef{XC@clr@#1@white}{0,0,0,0}%
  \@namedef{spc@infl@#1}{\let\spc@inflcommas\@empty}} % 4 value  = 4 -
                                % 0 commas

% A few auxliary macros:

\def\spc@nl{^^J}

\def\spc@getirbase/&#1 #2\@@{#1}
\def\spc@getirbaseC/&#1 #2\@@{#1 #2}

\def\spc@writecomp#1#2{%
  \advance\@tempcntb\@ne
  \edef#1{#1
    \the\numexpr\@tempcntb-\@tempcnta\relax\space
    index -#2\space mul 1.0 add mul\spc@nl}}

\def\spc@writecmykcomps#1,#2,#3,#4\@@{%
  \spc@writecomp\spc@@cyan{#1}%
  \spc@writecomp\spc@@magenta{#2}%
  \spc@writecomp\spc@@yellow{#3}%
  \spc@writecomp\spc@@black{#4}}

% And the main macro:

\newif\ifspc@dflt

\newcommand\definecolorspace{%
  \@ifstar
    {\spc@dflttrue\spc@defcs}%
    {\spc@dfltfalse\spc@defcs}}

\@onlypreamble\definecolorspace

\def\spc@defcs#1#2#3{%
  \@ifundefined{spc@defcs@#2}%
    {\spc@unknown{spc@defcs@#2}{color space type `#2'}}%
    {\protected@edef\spc@tempa{%
       \expandafter\noexpand\csname spc@defcs@#2\endcsname
       {#1}{#3}}%
     \spc@tempa}}

\def\spc@defcs@mixed#1#2{%
  \ifspc@dflt
     \PackageError{colorspace}{Unsupported}%
       {`mixed' only works with the unstarred command}%
  \fi
  \begingroup
    % the process part of the tint transform:
    \def\spc@@Pcyan{1.0\spc@nl}\def\spc@@Pmagenta{1.0\spc@nl}%
    \def\spc@@Pyellow{1.0\spc@nl}\def\spc@@Pblack{1.0\spc@nl}%
    % the spot part:
    \let\spc@@cyan\@empty\let\spc@@magenta\@empty
    \let\spc@@yellow\@empty\let\spc@@black\@empty
    % position on stack
    \edef\spc@@poscyan{0}\edef\spc@@posmagenta{1}%
    \edef\spc@@posyellow{2}\edef\spc@@posblack{3}%
    \@tempcntb\z@ % Number of colors
    \let\spc@pdfdoms\@empty % stores /Domain
    \let\spc@@pops\@empty
    \@for\spc@tempa:=#2\do{%
      \advance\@tempcntb\@ne % Count colors 
      \edef\spc@@pops{\spc@@pops\space pop}%  
      \edef\spc@pdfdoms{\spc@pdfdoms0 1 }}%
    \ifcase\@tempcntb\or1\or\spc@twocomps\or\or\else
      \PackageError{colorspace}{Too many inks}%
       {Currently, only up to 4 components are supported}%
    \fi 
    \@tempcnta\z@ % position on stack
    \let\spc@pdfdevn\@empty % stores names for /DeviceN
    \let\spc@pdfclrnts\@empty % stores /Colorants
    \let\spc@name\@empty % stores name for page /ColorSpace
    \def\spc@ir@cyan{Cyan}\def\spc@ir@magenta{Magenta}%
    \def\spc@ir@yellow{Yellow}\def\spc@ir@black{Black}%
    \@for\spc@tempa:=#2\do{%
      \spc@dospaces\spc@tempa
      \advance\@tempcnta\@ne
      \edef\spc@ir{\csname spc@ir@\spc@tempa\endcsname}%
      \@expandtwoargs\in@{,\spc@tempa,}{,cyan,magenta,yellow,black,}%
      \ifin@
        \edef\spc@pdfdevn{\spc@pdfdevn\space/\spc@ir}%
        \edef\spc@name{\spc@name &\spc@ir}%
        \expandafter
        \edef\csname spc@@P\spc@tempa\endcsname{%
          \the\numexpr\@tempcntb+\@nameuse{spc@@pos\spc@tempa}%
            -\@tempcnta\relax\space
          index neg 1.0 add\spc@nl}% ==========
      \else
        \@ifundefined{spc@ascmyk@\spc@tempa}%
          {\spc@unknown{spc@ascmyk@\spc@tempa}{spot color
             `\spc@tempa'}}%
          {}%
        \edef\spc@pdfdevn{\spc@pdfdevn\space
          /\expandafter\spc@getirbase\spc@ir\@@}%
        \edef\spc@pdfclrnts{\spc@pdfclrnts\space
          /\expandafter\spc@getirbaseC\spc@ir\@@}%
        \edef\spc@name{\spc@name
          &\expandafter\spc@getirbase\spc@ir\@@}%
        \expandafter\expandafter\expandafter\spc@writecmykcomps
          \csname spc@ascmyk@\spc@tempa\endcsname\@@
        \advance\@tempcntb-4\relax
      \fi}%
    \immediate\spc@Obj stream attr
      {/FunctionType 4
       /Domain [ \spc@pdfdoms]
       /Range [ 0 1 0 1 0 1 0 1 ]}%
      {\string{\space
       \spc@@Pcyan\spc@@cyan neg 1.0 add\spc@nl
       \spc@@Pmagenta\spc@@magenta neg 1.0 add\spc@nl
       \spc@@Pyellow\spc@@yellow neg 1.0 add\spc@nl
       \spc@@Pblack\spc@@black neg 1.0 add\spc@nl
       \the\numexpr4+\@tempcntb\relax\space 4 roll\spc@@pops
       \space\string}}%
    \immediate\spc@Obj{[ /DeviceN [\spc@pdfdevn\space] /DeviceCMYK
      \the\spc@Lastobj\space0 R
      << /Colorants <<\spc@pdfclrnts\space >> >> ]}%
    \expandafter\xdef\csname spc@ir@#1\endcsname{%
      /\spc@name\space\the\spc@Lastobj\space 0 R}% save ref to obj
    \let\spc@elt\relax
    \xdef\spc@csall{\spc@csall\spc@elt2{#1}}%
    \xdef\spc@tempa{%
      \expandafter\noexpand
      \csname spc@mix@\romannumeral\@tempcntb\endcsname
      {#1}{/\spc@name}}%
  \endgroup
  \spc@tempa}

% === ICC based default spaces ===

% luatex removed pdffiledump, so we use lua code.

\def\spc@defcs@iccbased#1#2{%
  \ifspc@dflt\else
     \PackageError{colorspace}{Unsupported}%
       {`iccbased' only works with the starred command}%
  \fi
  \begingroup
    % hex equivalents (which is the filedump format) and literal
    % (which is the lua format)
    \@namedef{spc@@47524159}{0}\@namedef{spc@@GRAY}{0}%
    \@namedef{spc@@52474220}{1}\@namedef{spc@@RGB }{1}%
    \@namedef{spc@@434D594B}{2}\@namedef{spc@@CMYK}{2}%
    \def\spc@@space{\ifcase\spc@tempa Gray\or RGB\or CMYK\fi}%
    \def\spc@@spacelc{\ifcase\spc@tempa gray\or rgb\or cmyk\fi}%
    % read the icc file and extract the space it applies to
    \ifx\pdffiledump\@undefined
      \directlua{
      local icc = io.open([[#2]], "r")
      if icc then
        icc:seek("set", 16)
        tex.print([[\noexpand\csname @namedef\endcsname{spc@tempa}{]]
                  .. icc:read(4) .. [[}]])
      end}%
    \else
      \edef\spc@tempa{\pdffiledump offset 16 length 4 {#2}}%
    \fi
    \@ifundefined{spc@@\spc@tempa}%
       {\PackageError{colorspace}{Unsupported ICC space}%
        {Currently, only Gray, RGB and CMYK are supported}}%
       {\edef\spc@tempa{\@nameuse{spc@@\spc@tempa}}}%
    \immediate\spc@Obj
      stream attr {\ifcase\spc@tempa
        /N 1 /Alternate /DeviceGray\or
        /N 3 /Alternate /DeviceRGB\or
        /N 4 /Alternate /DeviceCMYK\fi}% 
      file {#2}%
    \immediate\spc@Obj{[ /ICCBased \the\spc@Lastobj\space 0 R ]}% 
      % to the default color list, add an intermediate name *<model>
      % (only once) containing the last setting (add also the
      % actual name with flag 1 instead of 2)
    \let\spc@elt\relax
    \@ifundefined{spc@ir@*\spc@@spacelc}%
      {\xdef\spc@csall{\spc@csall\spc@elt2{*\spc@@spacelc}}}%
      {} % -- do nothing
    \expandafter\xdef\csname spc@ir@*\spc@@spacelc\endcsname{%
      /Default\spc@@space\space\the\spc@Lastobj\space 0 R}%
    \xdef\spc@csall{\spc@csall\spc@elt1{#1}}%
    \expandafter\xdef\csname spc@ir@#1\endcsname{%
      /Default\spc@@space\space\the\spc@Lastobj\space 0 R}% 
  \endgroup}

% ==== Overprint/Knokout ====

\DeclareOption{overprint}{\def\spc@op{1}}
\DeclareOption{opm=0}{\def\spc@op{0}\def\spc@opm{0}}
\DeclareOption{opm=1}{}
\DeclareOption{knockout}{\def\spc@op{2}} % After opm!
\def\spc@opm{1}
\ProcessOptions\relax

\ifx\spc@op\@undefined
  \spc@savedcatcodes
\endinput\fi % One line!

\def\spc@op@no{2}
\@namedef{spc@op@1}{1}
\@namedef{spc@op@0}{0}

\newcommand\overprintstate[1]{%
  \spc@unknown{spc@op@#1}{overprint state `#1'}%
  \ifnum\csname spc@op@#1\endcsname=\spc@op\else
    \expandafter\let\expandafter\spc@op\csname spc@op@#1\endcsname
    \spc@setop
  \fi}

\newcommand\textoverprint[2][\spc@opm]{{\overprintstate{#1}#2}}

\immediate\spc@Obj{<< /Type /ExtGState /op false /OP false >>}%
\edef\spc@tempa{/SPCko \the\spc@Lastobj\space 0 R }%
\immediate\spc@Obj{<< /Type /ExtGState /op true /OP true /OPM 0 >>}%
\edef\spc@tempa{\spc@tempa/SPCmz \the\spc@Lastobj\space 0 R }%
\immediate\spc@Obj{<< /Type /ExtGState /op true /OP true /OPM 1 >>}%
\edef\spc@tempa{\spc@tempa/SPCop \the\spc@Lastobj\space 0 R }%
\immediate\spc@Obj{<< \spc@tempa>>}%
\edef\spc@op@saveobj{\the\spc@Lastobj}

\AtBeginDocument{%
  \edef\spc@tempa{\global\spc@Pageresources{\the\spc@Pageresources
    \space /ExtGState \spc@op@saveobj\space 0 R }}%
  \spc@tempa}

\def\spc@setop{%
  \spc@Colorstack\spc@opstack push{\spc@getop}%
  \aftergroup\spc@resetop}
\def\spc@resetop{\spc@Colorstack\spc@opstack pop\relax}
\def\spc@getop{%
  \ifcase\spc@op
    /SPCmz gs
  \or
    /SPCop gs
  \or
    /SPCko gs
  \fi}

\chardef\spc@opstack\spc@Colorstackinit page direct{\spc@getop}

\spc@savedcatcodes

\endinput

MIT License
-----------

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.