LaTeX Forum

\documentclass{scrbook}
\usepackage[english]{babel}
\usepackage{blindtext}% nur für Fülltext
\usepackage{tikz}% lädt u.a. graphicx, xcolor
\usetikzlibrary{fadings}

\usepackage[automark]{scrlayer-scrpage}
\clearmainofpairofpagestyles
\lehead{\pagemark\hspace*{.5cm}\rightmark}
\rohead{\leftmark\hspace*{.5cm}\pagemark}
\renewcommand*{\chaptermarkformat}{}
\renewcommand*{\sectionmarkformat}{}
\setkomafont{pageheadfoot}{\normalfont\normalcolor}

\DeclareNewLayer[
  background,
  head,
  addvoffset=0.075cm,
  oddpage,
  mode=picture,
  contents={\putLL{%
    \makebox[\layerwidth][r]{\tikz\fill[darkgray,path fading=west] (0,0) rectangle (13.5,0.075);}
  }}
]{fadingheadrule.odd}
\DeclareNewLayer[
  clone=fadingheadrule.odd,
  evenpage,
  contents={\putLL{%
    \makebox[\layerwidth][l]{\tikz\fill[darkgray,path fading=east] (0,0) rectangle (13.5,0.075);}
  }}
]{fadingheadrule.even}

\AddLayersToPageStyle{scrheadings}{fadingheadrule.odd,fadingheadrule.even}

\renewcommand{\chapterpagestyle}{scrheadings}

\begin{document} 
\pagenumbering{roman} 
Hier könnten Danksagungen stehen.
\newpage 
Hier auch. 
\tableofcontents 
\chapter{Introduction} 
\section{Section}
\Blindtext[10]
\cleardoubleoddpage% wichtig vor dem Zurücksetzen des Seitenzählers
\pagenumbering{arabic} 
\chapter{Blablabla} 
\Blindtext 
\end{document}

\documentclass{book}
\usepackage[english]{babel}
\usepackage{blindtext}% nur für Fülltext
\usepackage{tikz}% lädt u.a. graphicx, xcolor
\usetikzlibrary{fadings}

\usepackage[pagestyles]{titlesec}% loads also titleps
\newpagestyle{main}% 
  {%
    \sethead 
       [{\thepage}\hspace*{0.5cm}\sectiontitle]% even left 
       []% even centre 
       []% even right 
       {}% odd left 
       {}% odd centre 
       {{\chaptertitle}\hspace*{0.5cm}{\thepage} }% odd right 
    \renewcommand\makeheadrule% das muss in der Seitenstildefinition erfolgen
      {\raisebox{-.4\baselineskip}% 
        {\ifodd\value{page}% 
           \makebox[\textwidth][r]% 
             {\tikz\fill[darkgray,path fading=west] (0,0) rectangle (11,0.075);}% 
         \else 
           \makebox[\textwidth][l]% 
             {\tikz\fill[darkgray,path fading=east] (0,0) rectangle (11,0.075);}% 
         \fi 
        }% 
      }%
  } 
\pagestyle{main} 

\assignpagestyle{\chapter}{main}% braucht titlesec

\begin{document} 
\pagenumbering{roman} 
Hier könnten Danksagungen stehen.
\newpage 
Hier auch. 
\tableofcontents 
\chapter{Introduction} 
\section{Section}
\Blindtext[10]
\cleardoublepage% wichtig vor dem Zurücksetzen des Seitenzählers
\pagenumbering{arabic} 
\chapter{Blablabla} 
\Blindtext[10]
\end{document} 

\documentclass[12pt,DIV=10,bibliography=totoc,egregdoesnotlikesansseriftitles]{scrbook}
\usepackage[english]{babel}
\usepackage{blindtext}
\usepackage{fontspec}
\usepackage{tikz}
\usetikzlibrary{fadings}
\setkomafont{pageheadfoot}{}
\setkomafont{pagenumber}{\slshape}
\usepackage{libertine}
%Kapitelformat
\setkomafont{disposition}{}
\setkomafont{chapter}{\Huge}
\setkomafont{chapterprefix}{\large\slshape}% Wirklich schräg mit 
\newkomafont{chapternumber}{\fontsize{120}{100}\itshape}% italic gemischt!?!

\renewcommand\chapterformat{%
  \usekomafont{chapter}
  \raisebox{1.25\baselineskip}{\makebox[0pt][r]{\usekomafont{chapterprefix}\chapapp\enskip}}%
  \raisebox{-.5\baselineskip}{\usekomafont{chapternumber}\thechapter}%
}

\newbox\chapternumberbox
\makeatletter
\renewcommand\chapterlinesformat[3]{%
  \ifstr{#1}{chapter}{%
    \ifstr{#2}{}{#3}{%
      \savebox\chapternumberbox{\chapterformat}%
      \parbox[tt]{\dimexpr\textwidth-\wd\chapternumberbox-1em\relax}{\raggedchapter#3}%
       \quad#2%
    }
    }{\@hangfrom{#2}{#3}}%
}
\makeatother

\renewcommand\raggedchapter{\raggedleft}

%\automark{chapter}

%Kopfzeilenformat
\usepackage[automark]{scrlayer-scrpage}
\rohead{\leftmark\hspace{.75cm}\pagemark}% usual would be \rightmark
\lehead{\pagemark\hspace{.75cm}\rightmark}% usual would be \leftmark
\renewcommand*{\chapterpagestyle}{headings}
\renewcommand*{\chaptermarkformat}{}
\renewcommand*{\sectionmarkformat}{}
\DeclareNewLayer[%
  background,
  oddpage,
  head,
  addvoffset=.45\baselineskip,
  contents={%
       \makebox[\textwidth][r]%
         {\tikz\fill[darkgray,path fading=west, fading angle=-1] (-8,-0.1) rectangle (5.5,0.002);}%
  }%
]{oddheadrule}
\DeclareNewLayer[%
  background,
  evenpage,
  head,
  addvoffset=.45\baselineskip,
  contents={%
       \makebox[\textwidth][l]%
         {\tikz\fill[darkgray,path fading=east, fading angle=1] (-8,-0.1) rectangle (5.5,0.002);}%
  }%
]{evenheadrule}
\AddLayersToPageStyle{scrheadings}{oddheadrule,evenheadrule}  
\AddLayersToPageStyle{plain.scrheadings}{oddheadrule,evenheadrule}

\begin{document}
\pagenumbering{roman}
Hier könnten Danksagungen stehen.
\newpage
Hier auch.
\tableofcontents
\chapter{Introduction}
\section{Section}
\pagenumbering{arabic}
\Blindtext[20]
\end{document}

chapter 1.
./test.tex:96: Missing number, treated as zero.
<to be read again> 
                   }
l.96 \section{Section}
                      
./test.tex:96: Illegal unit of measure (pt inserted).
<to be read again> 
                   }
l.96 \section{Section}
                      
./test.tex:96: Missing number, treated as zero.
<to be read again> 
                   }
l.96 \section{Section}
                      
./test.tex:96: Illegal unit of measure (pt inserted).
<to be read again> 
                   }
l.96 \section{Section}