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我的页眉中有一条从白色到灰色的“渐变线”。我想添加一个具有不同背景颜色的页面，因此渐变的颜色从该颜色而不是白色开始。问题是渐变的起点与页面的颜色不匹配...有什么想法吗？完整代码如下。

\documentclass[11pt, titlepage, openright]{book}

\usepackage[textwidth=13cm, left=2.5cm, bottom=2cm, top=2.5cm, paperwidth=20cm, paperheight=27cm, layoutwidth=19cm, layoutheight=26cm, layouthoffset=0.5cm, layoutvoffset=0.5cm, showcrop, asymmetric]{geometry}
\usepackage{fancyhdr}
\usepackage{tikz}
\usepackage{lipsum}

\definecolor{bgsummary}{cmyk}{0.2,0,0.1,0}

\pagestyle{fancy}
\renewcommand{\chaptermark}[1]{\markboth{#1}{}}
\fancyhead{}
\fancyfoot{}

\definecolor{grey}{rgb}{0.6,0.6,0.6}
\definecolor{darkgrey}{rgb}{0.4,0.4,0.4}

\setlength{\headheight}{24pt}
\fancyhead[RO]{\sffamily\bfseries\textcolor{grey}\leftmark\hspace{0.3cm}\sffamily\textcolor{darkgrey}\thepage}
\fancyhead[LE]{\sffamily\bfseries\textcolor{darkgrey}\thepage\hspace{0.3cm}\sffamily\textcolor{grey}\leftmark}
\renewcommand{\headrulewidth}{0.6pt}
\renewcommand{\footrulewidth}{0pt}

\renewcommand{\headrule}{%
\vskip-\baselineskip\vskip4pt
\ifodd\count0\hfill\begin{tikzpicture}
    \shade[left color=white, right color=black, dashed] (0,0) rectangle (4.98,0.01);
\end{tikzpicture}\else\begin{tikzpicture}
    \shade[left color=black, right color=white, dashed] (0,0) rectangle (4.98,.01);
\end{tikzpicture}\fi}

\fancypagestyle{summary}{%
\fancyhead[RO]{\sffamily\bfseries\footnotesize\textcolor{grey}\leftmark\hspace{0.3cm}\sffamily\bfseries\normalsize\textcolor{darkgrey}\thepage}
\fancyhead[LE]{\sffamily\bfseries\textcolor{darkgrey}\thepage\hspace{0.3cm}\sffamily\bfseries\footnotesize\textcolor{grey}\leftmark}
\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}

\renewcommand{\headrule}{%
\vskip-\baselineskip\vskip4pt
\ifodd\count0\hfill\begin{tikzpicture}
    \shade[left color=bgsummary, right color=darkgrey, dashed] (0,0) rectangle (4.98,0.01);
\end{tikzpicture}\else\begin{tikzpicture}
    \shade[left color=darkgrey, right color=bgsummary, dashed] (0,0) rectangle (4.98,0.01);
\end{tikzpicture}\fi}
}


\begin{document}

\chapter{Test chapter with a long title}
\lipsum

\newpage
\thispagestyle{summary}
\section{Summary}
\pagecolor{bgsummary}

\end{document}

答案1

如果您使用xcolor包选项，cmyk包xcolor会将所有颜色转换为cmyk模型。尽管如此，shade仍将使用rgb颜色。请参阅以下示例：

\documentclass[margin=10pt,
rgb, % this option is passed to xcolor
%cmyk % this option is passed to xcolor
]{standalone}
\usepackage{tikz}
\definecolor{bgsummary}{cmyk}{0.2,0,0.1,0}
\pagecolor{bgsummary}
\begin{document}
\tikz\draw[fill=bgsummary](0,0)rectangle(1,1);
\tikz\draw[shade,left color=bgsummary,right color=bgsummary](0,0)rectangle(1,1);
\end{document}

带选项的结果rgb

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带选项的结果cmyk

在此处输入图片描述

但您可以加载该fadings库并使用path fading。

\documentclass[11pt, titlepage, openright,
  cmyk% this option is passed to xcolor
]{book}

\usepackage[textwidth=13cm, left=2.5cm, bottom=2cm, top=2.5cm,
  paperwidth=20cm, paperheight=27cm,
  layoutwidth=19cm, layoutheight=26cm,
  layouthoffset=0.5cm, layoutvoffset=0.5cm,
  showcrop, asymmetric]{geometry}
\usepackage{fancyhdr}
\usepackage{tikz}
\usetikzlibrary{fadings}

\definecolor{bgsummary}{cmyk}{0.2,0,0.1,0}
\definecolor{grey}{rgb}{0.6,0.6,0.6}
\definecolor{darkgrey}{rgb}{0.4,0.4,0.4}

\pagestyle{fancy}
\renewcommand{\chaptermark}[1]{\markboth{#1}{}}
\fancyhead{}
\fancyfoot{}

\setlength{\headheight}{24pt}
\fancyhead[RO]{\sffamily\bfseries\textcolor{grey}%
  \leftmark\hspace{0.3cm}\sffamily\textcolor{darkgrey}\thepage}
\fancyhead[LE]{\sffamily\bfseries\textcolor{darkgrey}%
  \thepage\hspace{0.3cm}\sffamily\textcolor{grey}\leftmark}
\renewcommand{\headrulewidth}{0.6pt}
\renewcommand{\footrulewidth}{0pt}

\renewcommand{\headrule}{%
\vskip-\baselineskip\vskip4pt
\ifodd\count0\hfill\begin{tikzpicture}
    \fill[black,path fading=west] (0,0) rectangle (5.98,0.01);
\end{tikzpicture}\else\begin{tikzpicture}
    \fill[black,path fading=east] (0,0) rectangle (5.98,.01);
\end{tikzpicture}\fi}

\usepackage{lipsum}% dummy text
\begin{document}
\chapter{Test chapter with a long title}
\lipsum
\clearpage
\pagecolor{bgsummary}
\section{Summary}
\end{document}

请注意，我已使用5.98作为4.98标题规则矩形的宽度，并且摘要页面也获得了页面样式fancy。

在此处输入图片描述

答案2

问题在于您正在使用 CMYK 模型定义新的背景颜色并使用 RGB 模型进行渐变。

使用

\definecolor{bgsummary}{rgb}{0.8,1,0.9}

在此处输入图片描述

答案3

更新

tikz自 3.1.3 版起支持 CMYK 阴影。只需在加载前xcolor使用该选项加载即可。cmyktikz

其他答案很好地解释了你为什么会遇到这个问题。

有一个新的解决方案，使用pgf-cmykshadings支持 CMYK 阴影的包来解决此问题pgf。将文档的开头更改为：

\documentclass[11pt, titlepage, openright]{book}
\usepackage[cmyk]{xcolor}% always use CMYK
\usepackage{pgf-cmykshadings}% use CMYK in PGF shadings

您需要pgf-cmykshadings先加载tikz以确保到处都有 CMYK 阴影。我还会xcolor根据cmyk您的情况加载选项，并可能定义您的灰色cmyk。

\definecolor{grey}{cmyk}{0,0,0,0.4}
\definecolor{darkgrey}{cmyk}{0,0,0,0.6}

现在颜色将匹配，您将获得适合打印的 CMYK 文档。

在此处输入图片描述

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