highlight.sty

% Siavoosh Payandeh Azad Jan. 2019
% 2023-03-09: Adapted for use with luaicc by Marcel Krüger
\ProvidesPackage{highlight}[Cell background highlighting based on user data]
\RequirePackage{etoolbox}
\RequirePackage{pgf} % for calculating the values for gradient
\RequirePackage{xcolor} % enables the use of cellcolor make sure you have [table] option in the document class 
% Color set related!
\definecolor{high}{HTML}{ef3b2c}  % the color for the highest number in your data set
\definecolor{low}{HTML}{fff7bc}  % the color for the lowest number in your data set
\newcommand*{\opacity}{90}% here you can change the opacity of the background color!
%======================================
% Data set related!
\newcommand*{\minval}{0.0}% define the minimum value on your data set
\newcommand*{\maxval}{1.0}% define the maximum value in your data set!
%======================================

\ExplSyntaxOn
\lua_load_module:n{parse_icc_tex}
\LoadProfile \sRGBprofile {sRGB.icc}
\LoadProfile \lightnessProfile {lightness.icc}

\cs_new_protected:Npn \xcolorAsSrgb #1#2 {%
  \extractcolorspec{#2} \l_tmpa_tl
  \exp_last_unbraced:No \convertcolorspec {\l_tmpa_tl} {rgb} \l_tmpa_clist
  \tl_set:Nx #1 {
    \sRGBprofile
    \clist_use:Nn \l_tmpa_clist {~}
  }
}
\ExplSyntaxOff

  % gradient function!
\newcommand{\gradient}[1]{
  \gradientcell{#1}{\minval}{\maxval}{low}{high}{\opacity}%
}
%======================================
% gradient function single cell! 
\newcommand{\gradientcell}[6]{%
  % The values are calculated linearly between \minval and \maxval
  \ifdimcomp{#1pt}{>}{#3pt}{#1}{%
  \ifdimcomp{#1pt}{<}{#2pt}{#1}{%
    \pgfmathparse{int(round(1000*(#1/(#3-#2))-(\minval*(1000/(#3-#2)))))}%
    \xcolorAsSrgb \lowRgbColor {#5!#6}%
    \xcolorAsSrgb \highRgbColor {#4!#6}%
    \expanded{\noexpand\cellcolor[rgb]{\ApplyProfile delim, lch \sRGBprofile 2 \lowRgbColor \space \pgfmathresult \highRgbColor}}%
    \ifdimcomp{\ApplyProfile \lightnessProfile 2 \lowRgbColor \space \pgfmathresult \highRgbColor pt}{<}{.5pt} {%
      \color{white}%
    }{%
      \color{black}%
    }%
    #1
  }}%
}

lightness.icc