use .jpg (not .png)

Author: Naoki-Hiraoka

doc/fig/full-body-ik.jpg

@@ -2020,7 +2020,7 @@ \subsubsection{inverse-kinematicsのtarget-coordsに関数を指定する例}
 \subsubsection{重心位置を考慮したfullbody-inverse-kinematicsの例}
 \begin{figure}[htb]
   \begin{center}
-    \includegraphics[width=0.49\columnwidth]{fig/full-body-ik.png}
+    \includegraphics[width=0.49\columnwidth]{fig/full-body-ik.jpg}
     \caption{Example of InverseKinematics with root link virtual joint}
     \labfig{full-body-ik}
   \end{center}
@@ -2090,7 +2090,7 @@ \subsubsection{重心位置を考慮したfullbody-inverse-kinematicsの例}
 \subsubsection{外力を考慮したfullbody-inverse-kinematicsを解く例}
 \begin{figure}[htb]
   \begin{center}
-    \includegraphics[width=0.49\columnwidth]{fig/static-balance-ik.png}
+    \includegraphics[width=0.49\columnwidth]{fig/static-balance-ik.jpg}
     \caption{Example of InverseKinematics with external force}
     \labfig{static-balance-ik}
   \end{center}