"RaggedRight"

ptbposter/ptbposter-add.sty

 \ProvidesPackage{ptbposter-add}[2016/01/25 v0.1a supplements for ptbposter (RN)]
 
+\RequirePackage{ragged2e}
+
 \newcommand\putPicture[4][t]{%
   \trivlist\item\relax
   \noindent\begin{minipage}[t]{\linewidth}%
@@ -18,7 +20,7 @@
         \mbox{}
       \else
         \begin{minipage}[#1]{\dimexpr\linewidth-\width-\columnsep}%
-          \hspace{0pt}#3
+          \hspace{0pt}\RaggedRight#3
         \end{minipage}
       \fi
       \par\ifx\relax#4\relax\else\vskip\columnsep #4\fi