周期阴影中的帮助

Question

想知道如何制作循环的阴影

\usepackage[tikzpicture]
    \begin{document}[article
    \begin{tikzpicture}[x=\imagescale ,y=\imagescale]
    %posicione a imagem
    \node[anchor=south west,inner sep=0pt,outer sep=0pt] at (0,0)
    {\includegraphics[width=0.7\linewidth]{C:/Users/Heisenberg/Desktop/PI/Frame0}};
    %aqui comeca o desenho
    %bolas
    \draw[fill=lime] (48.0097,40.0473) circle (1.3);
    \draw[fill=violet] (48.08,90.0252) circle (1.3);
    \draw [yellow,fill=yellow] (54.2657,32.875) circle (1.3);
\end{tikzpicture}
\end{document}[article]