Is there an easy way to make pictures less fuzzy?

I am inserting a picture (png or jpg) using this command:

begin{figure}[htbp]
    centering
    includegraphics[scale=0.2]{multibranchbuild}
    caption{Jenkins多分支构建}
    label{fig:multibranchbuild}
end{figure}

but picture is rendered so fuzzy, I could see the individual pixels. What should I do to make the picture as clear as possible?