[O] How to use .pdf images on Latex export, and .png images on ODT export

[Giacomo M]

Dear all,

I was wondering what is the best way to include pdf images on latex 
export and png images on odt export (assuming same path, only extension 
changes). A macro like this one:
#+MACRO: figext @@latex:.pdf@@@@odt:.png@@
doesn't seem to work.
Thanks,

Giacomo