There's nothing you can do. PowerPoint is not color managed and that's where all attempts of getting this perfect are doomed to failure. Video in particular is critical, since on top of the lack of CM it is played by the embedded media player component, which can be mistweaked in a million ways. Just watching a video outside PP and cranking up brightness can completely screw you, because those settings stick globally, not to speak of customizations in the graphics driver also affecting the behavior of overlay drawing. See how this turns into a domino of cascading issues? At best you can adjust your footage by tweaking your colors with an adjustment so they look correct on exactly a handful of computers where no tweaks or adjustments have been applied, but otherwise this is a hopeless case. Even in a scenario where you may be able to get it right e.g. on a CEO's laptop, there's still the chance the colors shift when he plugs this on to an external beamer or different screen. Such is the nature of Office presentations. So rather trying to fix the unfixable, be upfront about it and offer them (paid) long-term assistance and possibly a hands on training so they at least don't mess up things you have meticulously adjusted to look right under very specific conditions.
Mylenium
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