Photoshop has a color grain filter that when moderately applied can make a digital picture look more like a traditional photograph. I'd like to introduce grain into my videos because after I noise reduce them, they appear to lose natural grain and look too smooth. I'm hoping that by introducing grain, my videos will look more like film.

Is there one for VirtualDub or AVISynth that I could try out?

I've tried one in Vegas Video but wasn't too happy with the results--it didn't look like natural film grain (the dithering pattern was too uniform and artificial). Also, I'd prefer to do it in VirtualDub since I already filter my videos (noise reduce) using VD filters and would like to avoid saving an intermediate AVI (to avoid recompressing and creating compression artifacts).

Perhaps someone can take the Photoshop grain filter and code it for video work.

Any in the works?