Change render resolution?

Hello,

When rendering a scene with AO, is there any way to control the resolution of the rendered image? My final image will be used in a print project, so will need to be of a sufficient size to resample/save in Photoshop.

How do the Quality settings within AO correlate to resolution?

Thanks in advance for any help,
-Greg

If you render to separate window (Extensions->AmbientOcclusion->RenderWindow), you can set an arbitrary resolution