latex中的图片布局，如何高效地利用空间

latex 一行能不能放3张图

这个博客写的好，解决了我的问题：

https://blog.csdn.net/qq_32791307/article/details/80715902

\begin{figure}  \centering

  \begin{minipage}[t]{.25\linewidth}
    \framebox{framed text}
    \caption{a figure}
  \end{minipage}
  \begin{minipage}[t]{.25\linewidth}
    \framebox{framed text}
    \caption{a figure}
  \end{minipage}
  \begin{minipage}[t]{.25\linewidth}
    \framebox{framed text}
    \caption{a figure}
  \end{minipage}
\end{figure}

结果如下：

不满足要求。原因是 \centering的位置写错了

这样写：

\begin{figure}
  \centering
  \begin{minipage}[t]{.25\linewidth}
    \framebox{framed text}
    \caption{a figure}
  \end{minipage}
  \begin{minipage}[t]{.25\linewidth}
    \framebox{framed text}
    \caption{a figure}
  \end{minipage}
  \begin{minipage}[t]{.25\linewidth}
    \framebox{framed text}
    \caption{a figure}
  \end{minipage}
\end{figure}

就是我们要的结果了

\begin{figure}[htbp]
    \centering
    \includegraphics[width=.25\textwidth]{Pictures/Fig-face feature PCA results.png}
    \includegraphics[width=.25\textwidth]{Pictures/Fig-face feature PCA results.png}
    \includegraphics[width=.25\textwidth]{Pictures/Fig-face feature PCA results.png}
\end{figure}

没有图标，不满足要求

\begin{figure}[htbp]
	\centering
	\begin{minipage}[c]{0.05\textwidth} 
			\centering
			\includegraphics[width=0.25\textwidth]{Pictures/Fig-face feature PCA results.png} %0.5指图片宽度
			\caption{渐变1}
		\end{minipage}%
	\begin{minipage}[c]{0.05\textwidth}
			\centering
			\includegraphics[width=0.25\textwidth]{Pictures/Fig-face feature PCA results.png}
			\caption{渐变2}
		\end{minipage}
	\begin{minipage}[c]{0.05\textwidth}
			\centering
			\includegraphics[width=0.25\textwidth]{Pictures/Fig-face feature PCA results.png}
			\caption{渐变3}
		\end{minipage}
	\begin{minipage}[c]{0.05\textwidth}
			\centering
			\includegraphics[width=0.25\textwidth]{Pictures/Fig-face feature PCA results.png}
			\caption{渐变4}  
		\end{minipage}
\end{figure}