Now that you mention it, any video clip you possess is (most likely) already compressed, so you would be wasting alot of HD space if you converted it to uncompressed video using Quicktime Pro, for example. Any download from a website or warez group, any clip from a VCD or DVD, any clip from a video camera; all of those things are compressed.

So it's either a question of using uncompressed video generated by a 3D software like Poser or Carrara, or using some standard compression format. If Carrara can handle Cinepak, maybe it can handle mpeg-1 (VCD), mpeg-2 (DVD) or typical warez clips (DivX 5.x). If not, we have to pressure Eovia to get up to speed on the most common formats.

If Photoshop has a good brush filter you like, then ask in the Photoshop forum for a batch technique to apply an action to a folder full of tiff images which represent the individual frames of your clip. These tiff images can then be recombined back into the video clip using Quicktime Pro or other video editors.