如何更改图像的标题格式？

Question

我把一张图片粘贴到文档中。默认情况下，标题对齐方式（图 3）是居中，标题前有一个冒号。

Fig. 3:我怎样才能使标签左对齐并从开启更改格式Fig. 3？

我的代码：

\setcounter{figure}{2}
\begin{figure}
    \centering
    \includegraphics[width=1\linewidth]{75_02-45.jpeg}\caption{}
    \label{fig}
\end{figure}

Answer 1

这可以吗？

\documentclass{article}
\usepackage{graphicx}
\usepackage{caption}

\makeatletter
\renewcommand{\fnum@figure}{Fig. \thefigure} % Changing the prefix to 'Fig.'
\makeatother

\begin{document}
Example:

\setcounter{figure}{2}
\begin{figure}[ht]
    \centering
    \includegraphics[width=0.5\linewidth]{frog.jpg}
    \captionsetup{justification=raggedright,singlelinecheck=false} % Left align the label
    \caption{} 
    \label{fig}
\end{figure}

\end{document}

输出：

Answer 2

和

\captionsetup[figure]{
  justification=raggedright,
  singlelinecheck=false, % <<< raggadright also when the caption is shorterthan a single line
  name={Fig.}
  }

完整代码

\documentclass{article}
\usepackage{showframe}% comment in the final document
\usepackage{graphicx}
\usepackage{caption}
\captionsetup[figure]{
  justification=raggedright,
  singlelinecheck=false, % <<< raggadright also when the caption is shorterthan a single line
  name={Fig.}
  }

\begin{document}
%\noindent
Example:

\setcounter{figure}{2}
\begin{figure}[ht]
    \centering
    \includegraphics[width=0.5\linewidth]{example-image-duck}
    \caption{} 
    \label{fig}
\end{figure}

\end{document}