I have an external 100 pages PDF document (not created by pdflatex) that I
\includegraphics page-wise into a beamer presentation. The external PDF document employs white as page color, but I need the background to be transparent.
Ideally, this would be an option one could pass to
\includegraphics – which I doubt to exist. However, I would also be open for some process involving external tools (
pdfjam, ImageMagick, Acrobat...).