What is the way to force \includegraphics to use specific file extension for all document?
If I have in the folder figure.pdf and figure.png
\includegraphics{figure} command will use figure.png, if I need *.pdf I could force to use it by typing: \includegraphics{figure.pdf}
But if I need sometimes to compile document with all figures with png extension or pdf, what should I change in graphics package settings?
