# customizing chapter title format in classicthesis

I'm using classicthesis and I'd like to change the formatting of the chapter title a little bit (f.e. size and color). I think I've found the according part in the classicthesis-style

% ********************************************************************
% layout of the chapter-, section-, subsection-, subsubsection-,
% ********************************************************************
\RequirePackage{titlesec}
% chapters
{% lines above and below, number right
\titleformat{\chapter}[display]%
{\relax}{\raggedleft{\color{halfgray}\chapterNumber\thechapter} \\ }{0pt}% change color to red
{\titlerule\vspace*{.9\baselineskip}\raggedright\spacedallcaps}[\normalsize\vspace*{.8\baselineskip}\titlerule]% change size to \huge
}{% something like Bringhurst
\titleformat{\chapter}[display]%
{\relax}{\mbox{}\oldmarginpar{\vspace*{-3\baselineskip}\color{halfgray}\chapterNumber\thechapter}}{0pt}%
{\raggedright\spacedallcaps}[\normalsize\vspace*{.8\baselineskip}\titlerule]%
}


but when I try to change color and size of the text, nothing happens.

 \documentclass[twoside,openright,titlepage,numbers=noenddot,headinclude, footinclude=true,cleardoublepage=empty,abstractoff, BCOR=5mm,paper=a4,fontsize=11pt,ngerman,american]{scrreprt}

\input{classicthesis-config}
\usepackage{lipsum}

\begin{document}

\part{Introduction}
\chapter{First chapter}
\section{First section}
\lipsum[1-18]
\end{document}

• KOMA classes such as scrreprt and titlesec do not cooperate very well. Try to comment out \pagestyle{scrheadings} – user31729 Jul 3 '14 at 10:56
• This doesn't work and in addition I loose my headers. – djanna Jul 3 '14 at 11:16
• By title you mean the page containing Part I INTRODUCTION or the header of the pages with new chapters? What you have added in your question is about chapters while the text is about the title format. – Pouya Jul 3 '14 at 14:32
• I'm sorry for the misunderstanding. I'd like to change the format of the chapter title. So "First chapter" shall be written in a different color and size (f.e. green and huge). The style of the chapter number and the line and everything else shall remain unchanged. Maybe I chose a wrong part from the file... that would explain, why changes didn't led to the expected results. – djanna Jul 3 '14 at 17:24

The following example code shows where to insert the modifications required (the relevant lines of code are marked with % change color and size here). I used a shade of green and \huge, but of course you can use the attributes that best suit your needs:

 \documentclass[
twoside,
openright,
titlepage,
numbers=noenddot,
footinclude=true,
cleardoublepage=empty,
abstractoff,
BCOR=5mm,
paper=a4,
fontsize=11pt,
ngerman,
american
]{scrreprt}
\input{classicthesis-config}
\usepackage{lipsum}

\makeatletter
{% lines above and below, number right
\titleformat{\chapter}[display]%
{\relax}
{\raggedleft{\color{halfgray}\chapterNumber\thechapter} \\ }
{0pt}%
{\color{green!70!black}\huge\titlerule\vspace*{.9\baselineskip}\raggedright\spacedallcaps}% change color and size here
[\normalcolor\normalsize\vspace*{.8\baselineskip}\titlerule]%
}
{% something like Bringhurst
\titleformat{\chapter}[display]%
{\relax}
{\mbox{}\oldmarginpar{\vspace*{-3\baselineskip}\color{halfgray}\chapterNumber\thechapter}}
{0pt}%
{\color{green!70!black}\huge\raggedright\spacedallcaps}% change color and size here
[\normalcolor\normalsize\vspace*{.8\baselineskip}\titlerule]%
}
\makeatother
\begin{document}


Do not make the changes in the original .sty files (this is never recommended); do them in your .tex file surrounded with \makeatletter, \makeatother, as in my example code.