Chapter number font size

Question

I borrowed this code from Clean Thesis template with a small modification in color selection.

\documentclass[b5paper,11pt]{scrbook}
\usepackage{lipsum}
\usepackage{mathpazo}
\usepackage{xcolor}

\renewcommand*\chapterheadstartvskip{\vspace*{-8.75em}}
\renewcommand*\chapterheadendvskip{\vspace*{2.5\baselineskip}}
\renewcommand*{\chapterformat}{%
    \ctchapternumber{\thechapter}%
}
\renewcommand{\chapterlinesformat}[3]{%
    \ctchaptertitle{#3}%
    #2%
}

\newcommand{\ctchapternumber}[1]{%
    \usekomafont{chapter}%
    \begin{minipage}[t]{0.3\textwidth}%
        \raggedleft{%
            {\color{red!50!black}\rule[-5pt]{2pt}{5cm}}%
            \quad%
            {\color{red!50!black}\fontsize{60}{60}\selectfont#1}%
        }%
    \end{minipage}%
}
\newcommand{\ctchaptertitle}[1]{%
    \usekomafont{chapter}%
    \begin{minipage}[t]{0.7\textwidth}%
        \vspace*{5.85em}%
        \raggedright%
        #1%
    \end{minipage}%
}

\begin{document}
    \chapter{Introduction}
    \lipsum[1]
\end{document}

This is the result I get.

As you can see, I already used font size 60 for chapter number but It doesn't get any bigger. It seems \fontsize{60}{60} has no effect on the chapter number font size. How do fix this?

Answer 1

Your code produces the warning:

LaTeX Font Warning: Font shape `OT1/cmss/bx/n' in size <60> not available
(Font)              size <24.88> substituted on input line 36.

So you have to use a scalable font like lmodern.

Additional remark: Do not redefine \chapterstartvskip and \chapterendvskip, use \RedeclareSectionCommand with option afterindent=false instead.

Example:

\documentclass[b5paper,11pt]{scrbook}
\usepackage{lipsum}
\usepackage{mathpazo}
\usepackage{xcolor}
\usepackage{lmodern}% added

\RedeclareSectionCommand[
  afterindent=false,
  beforeskip=-8.75em,
  afterskip=2.5\baselineskip
]{chapter}

\renewcommand*{\chapterformat}{%
    \ctchapternumber{\thechapter}%
}
\renewcommand{\chapterlinesformat}[3]{%
    \ctchaptertitle{#3}%
    #2%
}

\newcommand{\ctchapternumber}[1]{%
    \usekomafont{chapter}%
    \begin{minipage}[t]{0.3\textwidth}%
        \raggedleft{%
            {\color{red!50!black}\rule[-5pt]{2pt}{5cm}}%
            \quad%
            {\color{red!50!black}\fontsize{60}{60}\selectfont#1}%
        }%
    \end{minipage}%
}
\newcommand{\ctchaptertitle}[1]{%
    \usekomafont{chapter}%
    \begin{minipage}[t]{0.7\textwidth}%
        \vspace*{5.85em}%
        \raggedright%
        #1%
    \end{minipage}%
}

\begin{document}
    \chapter{Introduction}
    \lipsum[1]
\end{document}



\documentclass{scrbook}
\usepackage{blindtext}
\usepackage{scrlayer-scrpage}
\ifoot{Test}
\setkomafont{pagenumber}{}
\addtokomafont{pagehead}{\Huge}
\begin{document}
\Blinddocument
\end{document}

\documentclass{scrartcl}
%\usepackage{datatool}
\usepackage[%
    main=ngerman,
    %english,
    british,
    american,
    french,
]{babel}
\begin{document}
test
\end{document}

Result: