We've abandoned Macs long ago (well, when Avid gave them the boot to be precise), but at least I can talk about file formats from past experience a bit. The only critical issue I see is potential Gamma and color profile issues, so you may need to unify that between your Mac and PC. Still, even then QT on PC is different from Mac. There I would avoid Quicktime where possible. At best I'd use the PNG or Animation CoDecs, but PNG kinda sucks on PC. If you use LUTs and color profiles, TIFF sequences may be more efficient - they can embed color profiles and guaranty consistent handling on both ends, if you use CM. Otehr formats supporting profiels are of course PSDs and JPEGs. PNG is so-so. It's okay as long as you only use it on PC or Mac, but as soon as you hop platforms, it will show color shifts, depending on where it's used. It should be okay and consistent inside Adobe apps, though.
Thanks Mylenium for the useful info.
And what about DPX...could be an alternative?
Usually we do something like this (simplified idea): premiere -> after effects -> premiere -> speedgrade -> premiere, all on macs, mostly all prores/tiffs, comes out without big color shifts.
The AE and SG part (by our plans in the near future) will be on PC.
So, you're telling me I can keep consistent colors between platforms if I stay "all Adobe" and using Adobe's color management (same profile in both systems until final export)?
I hope color management in video is not complicated as in Desktop publishing world
Can't say much about DPX files, since our internal workflow is not based on any of that. CM should not be anywhere near as complicated. The most critical issue really being the Gamma values in conventional formats. As far as profiles are concerned, it usually is sufficient to either not use any profiles at all or simply tag everything with sRGB, depending on how e.g. your Photoshop is set up. The video programs will default to sRGB, anyway and on a calibrated monitor the color should be consistent across the board.