我的文档包含大量彩色 PGFPlot，这些 PGFPlot 是从外部数据文件生成的。为了节省打印成本，我想自动将附录中每个 PGFPlot 的颜色转换为灰度，这样我就可以在正文部分和附录的图形之间切换，颜色会自动调整。
我找到了几篇关于如何自动将 PDF 或包含的图形转换为灰度的帖子，但遗憾的是没有关于如何使用 PGFPlots 执行相同操作的信息。为了说明我的意思，我准备了一个相当长的 MWE，它与我的真实代码非常接近：
麦格：
\documentclass[12pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[usenames,dvipsnames,svgnames,x11names]{xcolor}
\usepackage{pgfplots}
\usepgfplotslibrary{groupplots}
\pgfplotsset{compat=1.9}
\usepackage{adjustbox}
\usepackage{float}
\floatstyle{boxed}
\restylefloat{figure}
\floatplacement{figure}{htb!}
\usepackage{placeins}
\usepackage{lipsum}
\begin{document}
\section{Introduction}
\lipsum[1]
\section{Body}
\lipsum[2]
\begin{figure}
\begin{adjustbox}{max width=\textwidth,max height=\textheight}
\begin{tikzpicture}
\begin{groupplot}[ybar=0pt,/pgf/bar width=1,ymin=0,xmin=0.5,xmax=5.5,width=\textwidth,group style={group size=1 by 2,xticklabels at=edge bottom,yticklabels at=edge left,vertical sep=18pt},ylabel style={rotate=-90,text width=1.8cm,align=right},axis x line*=left,point meta=explicit symbolic,every node near coord/.append style={font=\small},nodes near coords={\ifnum\pgfplotspointmeta>0 \pgfplotspointmeta\fi},cycle list={fill=gray!50,draw=black}]
\nextgroupplot [ymax=14,y=1.5mm,try min ticks=2,ylabel={Foo's Bar'ed}]
\addplot +[fill=green!50] table [y index=1, meta index=1] {mwe.dat};
\nextgroupplot [ymax=14,y=1.5mm,try min ticks=2,ylabel={Bar's Foo'ed}]
\addplot +[fill=orange!50] table [y index=2, meta index=2] {mwe.dat};
\end{groupplot}
\end{tikzpicture}
\end{adjustbox}
\caption{Colored Figure}
\end{figure}
\lipsum[3]
\FloatBarrier
\section{Appendix}
\lipsum[4]
\begin{figure}
\begin{adjustbox}{max width=\textwidth,max height=\textheight}
\begin{tikzpicture}
\begin{groupplot}[ybar=0pt,/pgf/bar width=1,ymin=0,xmin=0.5,xmax=5.5,width=\textwidth,group style={group size=1 by 2,xticklabels at=edge bottom,yticklabels at=edge left,vertical sep=18pt},ylabel style={rotate=-90,text width=1.8cm,align=right},axis x line*=left,point meta=explicit symbolic,every node near coord/.append style={font=\small},nodes near coords={\ifnum\pgfplotspointmeta>0 \pgfplotspointmeta\fi},cycle list={fill=gray!50,draw=black}]
\nextgroupplot [ymax=14,y=1.5mm,try min ticks=2,ylabel={Foo's Bar'ed}]
\addplot +[fill=green!50] table [y index=1, meta index=1] {mwe.dat};
\nextgroupplot [ymax=14,y=1.5mm,try min ticks=2,ylabel={Bar's Foo'ed}]
\addplot +[fill=orange!50] table [y index=2, meta index=2] {mwe.dat};
\end{groupplot}
\end{tikzpicture}
\end{adjustbox}
\caption{Grayscale Figure}
\end{figure}
\end{document}
数据表：
Day FooBar BarFoo
1 2 1
2 1 0
3 1 0
4 3 1
5 5 1
答案1
您可以\selectcolormodel{gray}在开始附录时简单地包含它。
代码（包含mwe.dat文件内容）：
\documentclass[12pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[usenames,dvipsnames,svgnames,x11names]{xcolor}
\usepackage{pgfplots}
\usepgfplotslibrary{groupplots}
\pgfplotsset{compat=1.9}
\usepackage{adjustbox}
\usepackage{float}
\floatstyle{boxed}
\restylefloat{figure}
\floatplacement{figure}{htb!}
\usepackage{placeins}
\usepackage{filecontents}
\usepackage{lipsum}
\begin{filecontents*}{mwe.dat}
Day FooBar BarFoo
1 2 1
2 1 0
3 1 0
4 3 1
5 5 1
\end{filecontents*}
\begin{document}
\section{Introduction}
\lipsum[1]
\section{Body}
\lipsum[2]
\begin{figure}
\begin{adjustbox}{max width=\textwidth,max height=\textheight}
\begin{tikzpicture}
\begin{groupplot}[ybar=0pt,/pgf/bar width=1,ymin=0,xmin=0.5,xmax=5.5,width=\textwidth,group style={group size=1 by 2,xticklabels at=edge bottom,yticklabels at=edge left,vertical sep=18pt},ylabel style={rotate=-90,text width=1.8cm,align=right},axis x line*=left,point meta=explicit symbolic,every node near coord/.append style={font=\small},nodes near coords={\ifnum\pgfplotspointmeta>0 \pgfplotspointmeta\fi},cycle list={fill=gray!50,draw=black}]
\nextgroupplot [ymax=14,y=1.5mm,try min ticks=2,ylabel={Foo's Bar'ed}]
\addplot +[fill=green!50] table [y index=1, meta index=1] {mwe.dat};
\nextgroupplot [ymax=14,y=1.5mm,try min ticks=2,ylabel={Bar's Foo'ed}]
\addplot +[fill=orange!50] table [y index=2, meta index=2] {mwe.dat};
\end{groupplot}
\end{tikzpicture}
\end{adjustbox}
\caption{Colored Figure}
\end{figure}
\lipsum[3]
\FloatBarrier
\section{Appendix}
\selectcolormodel{gray}
\lipsum[4]
\begin{figure}
\begin{adjustbox}{max width=\textwidth,max height=\textheight}
\begin{tikzpicture}
\begin{groupplot}[ybar=0pt,/pgf/bar width=1,ymin=0,xmin=0.5,xmax=5.5,width=\textwidth,group style={group size=1 by 2,xticklabels at=edge bottom,yticklabels at=edge left,vertical sep=18pt},ylabel style={rotate=-90,text width=1.8cm,align=right},axis x line*=left,point meta=explicit symbolic,every node near coord/.append style={font=\small},nodes near coords={\ifnum\pgfplotspointmeta>0 \pgfplotspointmeta\fi},cycle list={fill=gray!50,draw=black}]
\nextgroupplot [ymax=14,y=1.5mm,try min ticks=2,ylabel={Foo's Bar'ed}]
\addplot +[fill=green!50] table [y index=1, meta index=1] {mwe.dat};
\nextgroupplot [ymax=14,y=1.5mm,try min ticks=2,ylabel={Bar's Foo'ed}]
\addplot +[fill=orange!50] table [y index=2, meta index=2] {mwe.dat};
\end{groupplot}
\end{tikzpicture}
\end{adjustbox}
\caption{Grayscale Figure}
\end{figure}
\end{document}
这给出了输出
