este código está sendo construído a partir da solução fornecidaaqui onde uma imagem é adicionada aos cabeçalhos. No código doModelo Legrande Orange fornecido aqui,o programador usa um switch \chapterimage{chapter_head_1.pdf}para alterar as imagens que aparecem nos cabeçalhos dos capítulos.
Existe uma abordagem semelhante que pode ser empregada para alternar as imagens do capítulo do cabeçalho usando uma abordagem de "troca" semelhante ao código fornecido abaixo, em vez de redigitar e alterar os ambientes \fancyhead[O]e \fancyhead[E]para cada capítulo?
Aqui está o código original:
\documentclass[11pt,a4paper]{book}
\usepackage{calc}
\usepackage[left=1.5cm, right=1.5cm, bindingoffset=1.5cm, headheight=120pt, top={120pt+10mm}]{geometry}
\usepackage{fancyhdr}
\usepackage{titlesec}
\usepackage{tikz}
\usepackage{lipsum}
\usepackage{fourier}
\usepackage{etoolbox}
\patchcmd{\chapter}{\thispagestyle{plain}}{\thispagestyle{fancy}}{}{}
\definecolor{gmitblue}{RGB}{93,138,168}
\definecolor{line}{RGB}{70,160,216}
\usetikzlibrary{calc}
\renewcommand{\headrulewidth}{0pt}
\newcommand\hdheight{1in}
\newcommand\ftheight{.5in}
\pagestyle{fancy}
\fancyhf{}
\fancyhead[O]{%
\begin{tikzpicture}[overlay, remember picture]%
\fill[gmitblue] (current page.north west) rectangle ($(current page.north east)+(0,-\hdheight)$);
\draw[line] ([yshift=-\hdheight]current page.north west) -- ([yshift=-\hdheight]current page.north east);
\ifnum\value{chapter}=0
\node[anchor=south west, text width=11.5cm, text=white, font=\fontsize{.7cm}{1.5cm}\selectfont\bfseries] at ($(current page.north west)+(.5\hdheight,-\hdheight)$) {\raggedleft\rightmark};
\else
\node[anchor=south west, text width=2cm, text=white, font=\fontsize{2cm}{1.5cm}\selectfont\bfseries] (oddpagenum) at ($(current page.north west)+(.5\hdheight,-\hdheight)$) {\thechapter};
\node[anchor=south west, text width=11.5cm, text=white, font=\fontsize{.5cm}{1.5cm}\selectfont\bfseries] (chapter) at (oddpagenum.south east) {\quad TOPIC TO BE DISCUSSED};
\fi
\node[anchor=north east, inner xsep=5mm] at (current page.north east) {\includegraphics[height=120pt]{example-image-a}};
\end{tikzpicture}%
}
\fancyhead[E]{%
\begin{tikzpicture}[overlay, remember picture]%
\fill[gmitblue] (current page.north west) rectangle ($(current page.north east)+(0,-\hdheight)$);
\draw[line] ([yshift=-\hdheight]current page.north west) -- ([yshift=-\hdheight]current page.north east);
\node[anchor=south east, text width=7cm, text=white, font=\fontsize{.7cm}{1.5cm}\selectfont\bfseries] (evenpagenum) at ($(current page.north east)+(-.5\hdheight,-\hdheight)$) {\raggedleft\rightmark};
\node[anchor=north west, inner xsep=5mm] at (current page.north west) {\includegraphics[height=120pt]{example-image-b}};
\end{tikzpicture}%
}
\fancyfoot[CE]{
\begin{tikzpicture}[overlay, remember picture]%
\fill[gmitblue] (current page.south west) rectangle ($(current page.south east)+(0,.5in)$);
\node[anchor=south west, text=white, font=\Large\bfseries, minimum size=.5in] at (current page.south west) {\thepage};
\node[anchor=south, text=white, font=\large, minimum size=.5in] at (current page.south) {\leftmark};
\node[anchor=south east, text=white, font=\large, minimum size=.5in, inner xsep=5mm] at (current page.south east) {\today};
\end{tikzpicture}%
}
\fancyfoot[CO]{
\begin{tikzpicture}[overlay, remember picture]%
\fill[gmitblue] (current page.south west) rectangle ($(current page.south east)+(0,.5in)$);
\node[anchor=south west, text=white, font=\large, minimum size=.5in, inner xsep=5mm] at (current page.south west) {\today};
\node[anchor=south, text=white, font=\large, minimum size=.5in] at (current page.south) {\leftmark};
\node[anchor=south east, text=white, font=\Large\bfseries, minimum size=.5in] at (current page.south east) {\thepage};
\end{tikzpicture}%
}
\title{A reasonably long title}
\date{\today}
\author{The author}
\titleformat{\chapter}[display]
{\normalfont\huge\bfseries}{}{0pt}{\Huge}
\titlespacing*{\chapter} {0pt}{20pt}{40pt}
\begin{document}
\maketitle
\tableofcontents
\listoffigures
%have a different header image here
\chapter{Problem 1}
\section{Problem 1}
\lipsum[1]
\section{Solution 1}
\lipsum
\lipsum
%have a different header image here - say like the "example-image-d" and "example-image-e" images
\chapter{Problem 2}
\section{Problem 2}
\lipsum[1]
\end{document}
Responder1
Você pode usar macros ou caixas em vez de \includegraphics[…]{…}na definição do cabeçalho da página par e ímpar. E você pode definir um comando para alterar essas macros ou caixas. No exemplo a seguir eu uso caixas, porque configurar caixas uma vez e usá-las diversas vezes é mais rápido do que expandir macros diversas vezes:
\documentclass[11pt,a4paper]{book}
\usepackage{calc}
\usepackage[left=1.5cm, right=1.5cm, bindingoffset=1.5cm, headheight=120pt, top={120pt+10mm}]{geometry}
\usepackage{fancyhdr}
\usepackage{titlesec}
\usepackage{tikz}
\usepackage{lipsum}
\usepackage{fourier}
\usepackage{etoolbox}
\patchcmd{\chapter}{\thispagestyle{plain}}{\thispagestyle{fancy}}{}{}
\definecolor{gmitblue}{RGB}{93,138,168}
\definecolor{line}{RGB}{70,160,216}
\usetikzlibrary{calc}
\renewcommand{\headrulewidth}{0pt}
\newcommand\hdheight{1in}
\newcommand\ftheight{.5in}
\newsavebox\headimageodd
\newsavebox\headimageeven
\newcommand*{\headimages}[3][]{%
% #1 - optional argument added to the optional argument of both \includegraphics
% #2 - name of even/left side page head image
% #3 - name of odd/right side page head image
\savebox{\headimageeven}{%
\includegraphics[height=120pt,#1]{#2}%
}%
\savebox{\headimageodd}{%
\includegraphics[height=120pt,#1]{#3}%
}%
}
\headimages{example-image-b}{example-image-a}
\pagestyle{fancy}
\fancyhf{}
\fancyhead[O]{%
\begin{tikzpicture}[overlay, remember picture]%
\fill[gmitblue] (current page.north west) rectangle ($(current page.north east)+(0,-\hdheight)$);
\draw[line] ([yshift=-\hdheight]current page.north west) -- ([yshift=-\hdheight]current page.north east);
\ifnum\value{chapter}=0
\node[anchor=south west, text width=11.5cm, text=white, font=\fontsize{.7cm}{1.5cm}\selectfont\bfseries] at ($(current page.north west)+(.5\hdheight,-\hdheight)$) {\raggedleft\rightmark};
\else
\node[anchor=south west, text width=2cm, text=white, font=\fontsize{2cm}{1.5cm}\selectfont\bfseries] (oddpagenum) at ($(current page.north west)+(.5\hdheight,-\hdheight)$) {\thechapter};
\node[anchor=south west, text width=11.5cm, text=white, font=\fontsize{.5cm}{1.5cm}\selectfont\bfseries] (chapter) at (oddpagenum.south east) {\quad TOPIC TO BE DISCUSSED};
\fi
\node[anchor=north east, inner xsep=5mm] at (current page.north east) {\usebox\headimageodd};
\end{tikzpicture}%
}
\fancyhead[E]{%
\begin{tikzpicture}[overlay, remember picture]%
\fill[gmitblue] (current page.north west) rectangle ($(current page.north east)+(0,-\hdheight)$);
\draw[line] ([yshift=-\hdheight]current page.north west) -- ([yshift=-\hdheight]current page.north east);
\node[anchor=south east, text width=7cm, text=white, font=\fontsize{.7cm}{1.5cm}\selectfont\bfseries] (evenpagenum) at ($(current page.north east)+(-.5\hdheight,-\hdheight)$) {\raggedleft\rightmark};
\node[anchor=north west, inner xsep=5mm] at (current page.north west) {\usebox\headimageeven};
\end{tikzpicture}%
}
\fancyfoot[CE]{
\begin{tikzpicture}[overlay, remember picture]%
\fill[gmitblue] (current page.south west) rectangle ($(current page.south east)+(0,.5in)$);
\node[anchor=south west, text=white, font=\Large\bfseries, minimum size=.5in] at (current page.south west) {\thepage};
\node[anchor=south, text=white, font=\large, minimum size=.5in] at (current page.south) {\leftmark};
\node[anchor=south east, text=white, font=\large, minimum size=.5in, inner xsep=5mm] at (current page.south east) {\today};
\end{tikzpicture}%
}
\fancyfoot[CO]{
\begin{tikzpicture}[overlay, remember picture]%
\fill[gmitblue] (current page.south west) rectangle ($(current page.south east)+(0,.5in)$);
\node[anchor=south west, text=white, font=\large, minimum size=.5in, inner xsep=5mm] at (current page.south west) {\today};
\node[anchor=south, text=white, font=\large, minimum size=.5in] at (current page.south) {\leftmark};
\node[anchor=south east, text=white, font=\Large\bfseries, minimum size=.5in] at (current page.south east) {\thepage};
\end{tikzpicture}%
}
\title{A reasonably long title}
\date{\today}
\author{The author}
\titleformat{\chapter}[display]
{\normalfont\huge\bfseries}{}{0pt}{\Huge}
\titlespacing*{\chapter} {0pt}{20pt}{40pt}
\begin{document}
\maketitle
\tableofcontents
\listoffigures
\chapter{Problem 1}
\headimages{example-image-c}{example-image}
\section{Problem 1}
\lipsum[1]
\section{Solution 1}
\lipsum
\lipsum
\chapter{Problem 2}
\headimages{example-image-a}{example-image-b}
\section{Problem 2}
\lipsum[1]
\end{document}
Nota: não posso usar example-image-d, porque o pacote mwefornece apenas example-image-aaté example-image-c. Então usei example-imageem vez de example-image-ce mais uma vez example-image-ae example-image-c. Mas acho que você entenderá como usá-lo com imagens diferentes.