[Tex/LaTex] way to change papersize in beamer

beamerpaper-size

From what I have gathered on the interwebs, I found that beamer gives no basic options to change the papersize. I am however in desperate need of exactly that. Mind that I don't want to re-scale one or more frames to an A4, I want to actually change the size of every frame.

Is there any way to work around this?

edit:

@JosephWright The reason I need to change the paper size is because I need to end up with the different slides in PNG format. These png's have to be a certain size. I was planning on simply converting the pdf to png's like you could normally do with LaTeX, untill I found out the problem with resizing in beamer.

@ prettygully I have already looked at the beamerposter package, but it seems like beamerposter puts all the frames on one page, what would make the conversion to PNG's impossible

edit2:

@ Andrew Stacey Your answers solved my personal problem as I was unaware of aspect ratio and my own ratio happens to be incredibly close to 16/9. I will correct the dimensions during PNG conversion.

I am still interested if anyone can come up with a general answer to the question thought.

Best Answer

The class beamer uses the package geometry to setup the page dimension. The package geometry provides the command \geometry to set options in the preamble. So you can simple use:

\geometry{paper=a4}