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调整图像大小，使其跨越纸张高度，同时修剪宽度以适合纸张宽度

tag-icon • tag-icon graphics crop overpic
调整图像大小，使其跨越纸张高度，同时修剪宽度以适合纸张宽度

标题可能说明了一切；我想要一个图形，首先将图像居中并调整其大小以适合纸张高度，然后修剪图像以适合纸张宽度。

到目前为止，我都是手动进行修剪，但这很繁琐，而且需要很长时间。纸张宽度和高度的原因是，它是我们项目的首页，打印在纸上和 pdf 格式中时看起来都很漂亮。

这是我迄今为止使用的代码（手动方式）：

\usepackage{geometry}
\usepackage[percent]{overpic}
\usepackage[table]{xcolor} % for the custom frontpage color
\usepackage[breakable,most,skins,listings]{tcolorbox}

\begin{document}

\newgeometry{
top     =   0   cm,
bottom  =   0   cm,
right   =   0   cm,
left    =   0   cm
}

\begin{overpic}[trim=120pt 0pt 120pt 0pt, % <--- this is where the manual work is, the "problem"
            height=\paperheight]
            {frontpage.jpg} % <--- oversize image
    \put(0,0){\begin{tcolorbox}[
        enhanced,               
        width=\paperwidth,      
        arc=0mm,                
        boxsep=25pt,            
        toprule=0pt,            
        leftrule=0pt,           
        bottomrule=0pt,         
        rightrule=0pt,          
        colframe=frontpagecolor,       
        colback=frontpagecolor,        
        opacityframe=.6,        
        opacityback=.6,         
        fontupper=\raggedright] 
        {\color{white}
            \Huge{\textbf{project title}}
        
            \Large{\textit{project subtitle}}\\
            \Large{\textit{project second line of subtitle}}
        
            \vspace{0.5cm}
        
            \large{
            Semester project \\\vspace{5pt}
            Group \\\vspace{5pt}
            2\textsuperscript{nd} Semester \\\vspace{5pt}
            University \\\vspace{5pt}
            date 2021
            }
        }
    \end{tcolorbox}
    }
    \put(60,85){\includegraphics[height=3.5cm]{institution_logo.png}}
\end{overpic}

\end{document}

因此，澄清一下，我想要的是一张“自行裁剪”的图像后正在缩放以适合纸张高度。

不要犹豫提出问题或者要求我澄清一些事情，找到解决方案符合我的利益:)

答案1

您已在加载 tikz，为什么不使用它？图像将自动裁剪以适合页面。

\documentclass{article}
\usepackage[table]{xcolor} % for the custom frontpage color
\usepackage[breakable,most,skins,listings]{tcolorbox}

\newsavebox\tempbox

\begin{document}
\savebox\tempbox{\begin{tcolorbox}[% for tikzpicture inside another tikzpicture
        enhanced,               
        width=\paperwidth,      
        arc=0mm,                
        boxsep=25pt,            
        toprule=0pt,            
        leftrule=0pt,           
        bottomrule=0pt,         
        rightrule=0pt,          
        %colframe=frontpagecolor,% from overpic?      
        %colback=frontpagecolor,        
        opacityframe=.6,        
        opacityback=.6,         
        fontupper=\raggedright] 
        {\color{white}
            \Huge{\textbf{project title}}
        
            \Large{\textit{project subtitle}}\\
            \Large{\textit{project second line of subtitle}}
        
            \vspace{0.5cm}
        
            \large{
            Semester project \\\vspace{5pt}
            Group \\\vspace{5pt}
            2\textsuperscript{nd} Semester \\\vspace{5pt}
            University \\\vspace{5pt}
            date 2021
            }
        }%
    \end{tcolorbox}}%
\begin{tikzpicture}[overlay,remember picture]
  \node[opacity=1] at (current page.center) {\includegraphics[height=\paperheight]{example-image-a}};
  \node[below] at (current page.north) {\usebox\tempbox};
\end{tikzpicture}%
\newpage
\end{document}

演示

答案2

\documentclass{article}
\usepackage{lipsum} %% gives dummy text for this file
\usepackage{eso-pic,graphicx}
\AddToShipoutPictureBG{%
    \AtPageLowerLeft{\includegraphics[width=\paperwidth,height=\paperheight]{example-image-a}}
}
\begin{document}
    \lipsum
\end{document}

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