Je n'arrive pas à changer les couleurs et tailles des différents chapitres, il doit manquer un package mais je ne sais lequel. \documentclass[a4paper, english, french, 11pt]{book} % A4 paper size, default 11pt font size and oneside for equal margins \usepackage[svgnames]{xcolor} % Required for colour specification \usepackage[utf8]{inputenc} % Required for inputting international characters \usepackage[T1]{fontenc} % Output font encoding for international characters \usepackage{fouriernc} % Use the New Century Schoolbook font \usepackage{graphicx} \usepackage{babel} \usepackage[explicit]{titlesec} \usepackage{setspace} \definecolor{darkblue}{rgb}{0.12,0.47,0.87} \newlength\chapnumb \setlength\chapnumb{3cm} \onehalfspacing %\titleformat{\chapter}[display] {\fontsize{17pt}{12pt}\selectfont \bfseries}{\textcolor{darkblue} {\chaptertitlename\ \thechapter: #1}}{20pt}{\Huge} %\titleformat{name=\chapter,numberless}[display] {\fontsize{17pt}{12pt}\selectfont \bfseries}{\textcolor{darkblue} {#1}}{20pt}{\Huge} \titleformat{\chapter}[block] { \normalfont\sffamily}{}{0pt} { \parbox[b]{\chapnumb}{ \fontsize{90}{10}\selectfont\thechapter} \parbox[b]{\dimexpr\textwidth-\chapnumb\relax}{ \raggedleft \hfill{{#1}}\\ \rule{\dimexpr\textwidth-\chapnumb\relax}{0.4pt} } } \titleformat{name=\chapter,numberless}[block] {\normalfont\sffamily}{}{0pt} {\parbox[b]{\chapnumb}{% \mbox{}}% \parbox[b]{\dimexpr\textwidth-\chapnumb\relax}{% \raggedleft% \hfill{\Large#1}\\ \rule{\dimexpr\textwidth-\chapnumb\relax}{0.4pt}}} \begin{document} \chapter{Préface} \chapter{Caractéristiques techniques} \chapter{test} \end{document]\end{document] J'ai déja utilisé ce premier exemple ci dessous mais dans le cas ci dessus je n'arrive pas a changer la taille des chiffres ni a changer les couleurs séparément chiffre/titre \documentclass[a5paper,12pt]{book} \usepackage[francais]{babel} \usepackage[T1]{fontenc} \usepackage[utf8]{inputenc} \usepackage[explicit]{titlesec} \usepackage{lmodern} \usepackage{kpfonts} \usepackage{booktabs} \usepackage{pdfpages} \usepackage{siunitx} \usepackage{pgfplots} \usepackage{floatrow} \usepackage{caption} \usepackage{graphicx} \usepackage{listings} \usepackage{microtype} \usepackage{subfig} \usepackage{varioref} \usepackage{multirow} \usepackage{array} \usepackage{chemformula} \usepackage{xcolor} \usepackage[xindy,quiet]{imakeidx} \usepackage[autostyle]{csquotes} \usepackage[backend=biber,sorting=none,style=numeric-comp]{biblatex} \usepackage{hyperref} \usepackage[T1]{fontenc} \usepackage[utf8]{inputenc} \usepackage{kpfonts} \usepackage{booktabs} \usepackage{pdfpages} \usepackage{siunitx} \usepackage{pgfplots} \usepackage{floatrow} \usepackage{caption} \usepackage{graphicx} \usepackage{listings} \usepackage{microtype} \usepackage{subfig} \usepackage{varioref} \usepackage{multirow} \usepackage{array} \usepackage{xcolor} \usepackage[xindy,quiet]{imakeidx} \usepackage[autostyle]{csquotes} \usepackage[backend=biber,sorting=none,style=numeric-comp]{biblatex} \usepackage{hyperref} \usepackage{setspace} \definecolor{darkblue}{rgb}{0.12,0.47,0.87} \newlength\chapnumb \setlength\chapnumb{3cm} \onehalfspacing \usepackage[a5paper]{geometry} %\titleformat{\chapter}[display] {\fontsize{17pt}{12pt}\selectfont \bfseries}{\textcolor{darkblue} {\chaptertitlename\ \thechapter: #1}}{20pt}{\Huge} %\titleformat{name=\chapter,numberless}[display] {\fontsize{17pt}{12pt}\selectfont \bfseries}{\textcolor{darkblue} {#1}}{20pt}{\Huge} \titleformat{\chapter}[block] { \normalfont\sffamily}{}{0pt} { \parbox[b]{\chapnumb}{ \fontsize{90}{10}\selectfont\thechapter} \parbox[b]{\dimexpr\textwidth-\chapnumb\relax}{ \raggedleft \hfill{{#1}}\\ \rule{\dimexpr\textwidth-\chapnumb\relax}{0.4pt} } } \titleformat{name=\chapter,numberless}[block] {\normalfont\sffamily}{}{0pt} {\parbox[b]{\chapnumb}{% \mbox{}}% \parbox[b]{\dimexpr\textwidth-\chapnumb\relax}{% \raggedleft% \hfill{\Large#1}\\ \rule{\dimexpr\textwidth-\chapnumb\relax}{0.4pt}}} \begin{document} \chapter{Préface} \chapter{chap1} \end{document}

Je n'arrive pas a à changer les couleurs, couleurs et tailles des différents chapitres, il doit manquer un package mais je ne sait sais lequel. \documentclass[a4paper, english, french, 11pt]{book} % A4 paper size, default 11pt font size and oneside for equal margins \usepackage[svgnames]{xcolor} % Required for colour specification \usepackage[utf8]{inputenc} % Required for inputting international characters \usepackage[T1]{fontenc} % Output font encoding for international characters \usepackage{fouriernc} % Use the New Century Schoolbook font \usepackage{graphicx} \usepackage{babel} \usepackage[explicit]{titlesec} \usepackage{setspace} \definecolor{darkblue}{rgb}{0.12,0.47,0.87} \newlength\chapnumb \setlength\chapnumb{3cm} \onehalfspacing %\titleformat{\chapter}[display] {\fontsize{17pt}{12pt}\selectfont \bfseries}{\textcolor{darkblue} {\chaptertitlename\ \thechapter: #1}}{20pt}{\Huge} %\titleformat{name=\chapter,numberless}[display] {\fontsize{17pt}{12pt}\selectfont \bfseries}{\textcolor{darkblue} {#1}}{20pt}{\Huge} \titleformat{\chapter}[block] { \normalfont\sffamily}{}{0pt} { \parbox[b]{\chapnumb}{ \fontsize{90}{10}\selectfont\thechapter} \parbox[b]{\dimexpr\textwidth-\chapnumb\relax}{ \raggedleft \hfill{{#1}}\\ \rule{\dimexpr\textwidth-\chapnumb\relax}{0.4pt} } } \titleformat{name=\chapter,numberless}[block] {\normalfont\sffamily}{}{0pt} {\parbox[b]{\chapnumb}{% \mbox{}}% \parbox[b]{\dimexpr\textwidth-\chapnumb\relax}{% \raggedleft% \hfill{\Large#1}\\ \rule{\dimexpr\textwidth-\chapnumb\relax}{0.4pt}}} \begin{document} \chapter{Préface} \chapter{Caractéristiques techniques} \chapter{test} \end{document]

Je n'arrive pas a changer les couleurs, tailles des différents chapitres, il doit manquer un package mais je ne sait lequel. \documentclass[a4paper, english, french, 11pt]{book} % A4 paper size, default 11pt font size and oneside for equal margins \usepackage[svgnames]{xcolor} % Required for colour specification \usepackage[utf8]{inputenc} % Required for inputting international characters \usepackage[T1]{fontenc} % Output font encoding for international characters \usepackage{fouriernc} % Use the New Century Schoolbook font \usepackage{graphicx} \usepackage{babel} \usepackage[explicit]{titlesec} \usepackage{setspace} \definecolor{darkblue}{rgb}{0.12,0.47,0.87} \newlength\chapnumb \setlength\chapnumb{3cm} \onehalfspacing %\titleformat{\chapter}[display] {\fontsize{17pt}{12pt}\selectfont \bfseries}{\textcolor{darkblue} {\chaptertitlename\ \thechapter: #1}}{20pt}{\Huge} %\titleformat{name=\chapter,numberless}[display] {\fontsize{17pt}{12pt}\selectfont \bfseries}{\textcolor{darkblue} {#1}}{20pt}{\Huge} \titleformat{\chapter}[block] { \normalfont\sffamily}{}{0pt} { \parbox[b]{\chapnumb}{ \fontsize{90}{10}\selectfont\thechapter} \parbox[b]{\dimexpr\textwidth-\chapnumb\relax}{ \raggedleft \hfill{{#1}}\\ \rule{\dimexpr\textwidth-\chapnumb\relax}{0.4pt} } } \titleformat{name=\chapter,numberless}[block] {\normalfont\sffamily}{}{0pt} {\parbox[b]{\chapnumb}{% \mbox{}}% \parbox[b]{\dimexpr\textwidth-\chapnumb\relax}{% \raggedleft% \hfill{\Large#1}\\ \rule{\dimexpr\textwidth-\chapnumb\relax}{0.4pt}}} \begin{document} \chapter{Préface} \chapter{Caractéristiques techniques} \chapter{test} \end{document]