If it’s supposed to be live action, I would think using AE would be considered cheating…
Anyway, to answer your questions, most of what you’re asking is very easy to do in AE.
However, before I start I have another caveat. Getting it done easily does require knowing the program for it to go quickly or smoothly. Understand that AE is not a piece of software like iMovie or Movie Maker that can be figured out within a couple of hours (or days). There is a reason people in the motion graphics industry get paid like we do. It’s not just our design sense; we know how to wrangle this complex program to get it to do what we want and under tight deadlines.
To be perfectly honest, I think you should work in Photoshop, not After Effects, simply because it’ll be a lot more like stop-motion that way. Since you won’t be getting the animation exactly right on each frame it’ll have that lovely, jumpy, analog quality of a real stop-motion piece. It’ll be less cheating and you already know the program. You can even get video files into Photoshop!
However, if you’re determined to do it in AE, here we go:
To get graphics to move behind a person is going to require either filming on a chroma key screen (green screen or blue screen) or rotoscoping. You’re doing what is supposed to be a stop-motion animation so I’m assuming you’ll have much less than 30 frames per second to be working with, so if you do end up having to rotoscope, it won’t be as painful as it otherwise would be.
You mention getting paint droplets to act as a transition. You can either use them as a track matte or simply animate their position.
You also mention something about droplets rising and spinning around to form an image. I haven’t seen the music video you referenced, so I’m just guessing at what that might look like. There are two options:
1. The droplets are somewhat like the metal in Terminator 2 that is very 3d looking and forms the shape of a person in 3d and eventually morphs into being the person.
2. The drops just work in 2d.
If it’s the 2nd option, grand! AE can do that easily with my previously mentioned tip.
If it’s the 1st option…AE can possibly be coerced into doing it, but it will require quite a bit of work.
You can use the puppet tool (as well as other distortion effects such as Reshape) to animate paint splatters to move and change shape. If you just want them to grow on the screen, you could start with a picture of a paint splatter then use a mask to reveal it over time. You might want to take a look at this tutorial about growing design elements.
As far as color blends and things like that go, AE is a lot like Photoshop. There are blending modes, etc.
I would highly suggest trying to learn the basics of the program before you count on using AE for your actual project. A great place to start is the AE manual. You can either read the file that comes bundled with the software or you can read the online version (which gets updated with new info and has great links to tutorials and other resources on the web). Another great resource is the AE Basic Training available for free at VideoCopilot.net. There are also lots of good books out there – such as the ones by Chris and Trish Meyer and some amazingly good DVD’s – such as the ones from Total Training. Also, don’t forget the great tutorials here at the COW.
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