Photoshop re-render plugin

Hello, Greetings, cheers, whatsup,

has anyone heard of a plugin for Photoshop that re-render pictures w/o loss of quality. Example: I have a 3 by 4 300 dpi pic and I need it in 9 by 12 in 300 dpi… Ive heard rumors of such, but couldt exaclty identify one.

thanks in advance,

m.