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选择彩色或黑白图片

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选择彩色或黑白图片

我有一份文档，既可以打印出来，也可以在屏幕上显示。第一种情况下，图片应该是黑白的，另一种情况下，图片可以是彩色的。有了它，\newif我可以轻松处理这个问题。

我在专用文件夹中存储了两个版本的图片，_c彩色图片带有后缀。

我现在希望修补该\includegraphics[opt]{filename}命令，以便

  1. 它首先检查\filename@base _c\filename@ext所提供的内容filename（带或不带扩展名）
  2. 如果文件不存在，则检查\filename@base\filename@ext
  3. 包含相关图片，如果未找到文件则会引发错误。

我尝试\Ginclude@graphics按照说明调整命令这里没有成功...为了编译下面的 MWE，只需在 cwd 中放置两张Image.…图片。Image_c.…

% !TeX TS-encoding = utf8
% !TeX TS-spellcheck = fr_FR
% !BIB TS-program = biber
% !TeX TS-program = lualatex

\documentclass[12pt,a4paper]{memoir}

\usepackage{graphicx}

\makeatletter
\def\Ginclude@graphics#1{%
    \begingroup
    \let\input@path\Ginput@path
    \filename@parse{#1}%
    \ifx\filename@ext\relax
    \@for\Gin@temp:=\Gin@extensions\do{%
        \ifx\Gin@ext\relax
        \Gin@getbase _c\Gin@temp
        \fi
    }%
    \else
    \Gin@getbase{\Gin@sepdefault\filename@ext}%
    \ifx\Gin@ext\relax
    \@warning{File `#1_c' not found}%
    \def\Gin@base{\filename@area\filename@base _c}%
    \edef\Gin@ext{\Gin@sepdefault\filename@ext}%
    \fi
    \fi
    %%% add new test here?
    \ifx\Gin@ext\relax
    \filename@parse{#1}%
    \ifx\filename@ext\relax
    \@for\Gin@temp:=\Gin@extensions\do{%
        \ifx\Gin@ext\relax
        \Gin@getbase\Gin@temp
        \fi
    }%
    \else
    \Gin@getbase{\Gin@sepdefault\filename@ext}%
    \ifx\Gin@ext\relax
    \@warning{File `#1' not found}%
    \def\Gin@base{\filename@area\filename@base}%
    \edef\Gin@ext{\Gin@sepdefault\filename@ext}%
    \fi
    \fi
    \fi
    %%%
    \ifx\Gin@ext\relax
    \@latex@error{File `#1' not found}
    {I could not locate the file with any of these extensions:^^J
        \Gin@extensions^^J\@ehc}
    \else
    \@ifundefined{Gin@rule@\Gin@ext}%
    {\ifx\Gin@rule@*\@undefined
        \@latex@error{Unknown graphics extension: \Gin@ext}\@ehc
        \else
        \expandafter\Gin@setfile\Gin@rule@*{\Gin@base\Gin@ext}%
        \fi}%
    {\expandafter\expandafter\expandafter\Gin@setfile
        \csname Gin@rule@\Gin@ext\endcsname{\Gin@base\Gin@ext}}%
    \fi
    \endgroup}
\makeatother

\begin{document}

    \includegraphics[width=.7\linewidth]{Image}

\end{document}

答案1

这是一个解决方案。

\documentclass{article}
\usepackage{graphicx}

\newif\ifvcol 
\vcoltrue

\let\WBCfile\relax
\makeatletter  
\newcommand{\WBCincludegraphics}[2][]{%
\ifvcol
\@for\Gin@temp:=\Gin@extensions\do{%
\IfFileExists{#2_c\Gin@temp}{%
\def\WBCfile{#2_c\Gin@temp}}{}}%
\ifx\WBCfile\relax
\includegraphics[#1]{#2}%
\else
\includegraphics[#1]{#2_c}%
\fi
\else
\includegraphics[#1]{#2}%
\fi
\let\WBCfile\relax}
\makeatother

\begin{document}
\WBCincludegraphics[scale=.5]{example-image}
\end{document}

答案2

@touhami 解决了我的 OP。

但是，为了保留原始\includegraphics命令，我将使用下面的代码片段（根据一些测试，它似乎有效）。因此我可以提供带或不带扩展名的文件名。

\documentclass[12pt,a4paper]{memoir}
\newif\ifvcol 
\vcolfalse

\usepackage{graphicx}
\makeatletter
\def\Ginclude@graphics#1{%
    \begingroup
    \let\input@path\Ginput@path
    \filename@parse{#1}%
    \ifvcol
    \filename@parse{\filename@area\filename@base _c}%
    \@for\Gin@temp:=\Gin@extensions\do{%
        \ifx\Gin@ext\relax
            \Gin@getbase{\Gin@temp}
        \fi}%
    \fi
    \ifx\Gin@ext\relax
        \filename@parse{#1}%
        \ifx\filename@ext\relax
            \@for\Gin@temp:=\Gin@extensions\do{%
                \ifx\Gin@ext\relax
                    \Gin@getbase{\Gin@temp}
                \fi}%
        \else
            \Gin@getbase{\Gin@sepdefault\filename@ext}%
            \ifx\Gin@ext\relax
                \@warning{File `#1' not found}%
                \def\Gin@base{\filename@area\filename@base}%
                \edef\Gin@ext{\Gin@sepdefault\filename@ext}%
            \fi
        \fi
    \fi

    \ifx\Gin@ext\relax
        \@latex@error{File `#1' not found}% <----------------------------- MODIFIED
            {I could not locate the file with any of these extensions:^^J% <-- MODIFIED
                \Gin@extensions^^J\@ehc}% <-------------------------------------- MODIFIED
    \else
        \@ifundefined{Gin@rule@\Gin@ext}%
            {\ifx\Gin@rule@*\@undefined
                \@latex@error{Unknown graphics extension: \Gin@ext}\@ehc
            \else
                \expandafter\Gin@setfile\Gin@rule@*{\Gin@base\Gin@ext}%
            \fi}%
            {\expandafter\expandafter\expandafter\Gin@setfile
                \csname Gin@rule@\Gin@ext\endcsname{\Gin@base\Gin@ext}}%
    \fi
    \endgroup}
\makeatother


\newcommand{\fig}[2][.26]{{\par\centering\includegraphics[width=#1\linewidth]{#2}\par}}
\usepackage{lipsum}
\begin{document}
    \lipsum[1]
    \fig{Image}
    \lipsum[2]
    \includegraphics[height=2cm]{Image.png}
\end{document}

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