skyjedi2005: Yeah, I suppose you could just up-sample the 2k CGI effects to 4k, assuming they didn't do the effects at over 2k in the first place and then just down-sampled them to 2k for immediate use in the film, with the higher res CGI source files being held in reserve until needed later (when they do the 4-6k film scan).

I find it hard to believe they'd be dumb enough to make all these fancy CGI effects and then not have enough res in the source CGI files to handle possible future requirements for more res. What are you going to do, have to go back and completely re-render every single frame of CGI to exactly match the existing CGI, except at higher res this time? Why do it twice, that would be stupid. Anyhow, if they just up-sample it from 2k to 4k, I guess that would be adequate.

I agree, digital effects should used when and where something can't be done any other way, otherwise all effects, scenes, etc. should be done for real. It's *so* much more convincing and believable that way. Especially with big-budget movies like Star Wars, there's no excuse for cutting corners.