[PD] using pix objects on rendered graphics in gem

[Peter Worth]

hello.

i havent used gem much before, sorry for asking this but i cant find
any answers in documentation. i've got some geos being rendered to the
screen, and i want to apply a convolution to the entire result.. can i
use pix_convolve for this in some way, or can it only be used for
image files and textures etc?

and is there a better or cheaper way to do this than use convolution?
i just want to blur everything (a soften effect not a motion blur).

thanks.
pete.