CopyMask2Layer is a new After Effects script at AE Scripts:
When you copy a mask from one layer to another it often changes its position. With CopyMask2Layer you can copy masks while keeping them perfectly in place - even if the layers are moving and if the mask path is keyframed.
The demo video will immediately answer the questions you have in mind!
A complete outline of the DVD training course Adobe After Effects CS5: Learn by Video can be found with the 20th free video, Removing a Logo from a Moving Image. (Streaming only on Video2Brain). A similar beginners' video is also available, Removing an Object with Clone Stamp (embedded below from a Peachpit podcast series).
@AdobeAE notes a tutorial from AE CS5: Learn By Video on obscuring a face in After Effects by isolating it with Roto Brush & selectively applying a Mosaic effect (embedded below). There's more on the Roto Brush in AE Help and in posts tagged roto.
Chris Zwar shared some resources on first stabilizing shots with camera movement, then doing keys or roto in a thread on the AE-List on the Roto Brush tool ("roto assist" when it bogs down) .
"Roto Brush will disappoint anyone who HASN'T had to do meticulous frame-by-frame rotoscope work before, and therefore doesn't know how tedious and difficult roto can be. Having a tool that gets you 70% of the way there is still a valuable time saver. But I haven't yet had a shot where it worked perfectly by itself. [snip]
In the same way that keying can be improved by pre-prossessing the footage to remove grain and adjust hue/saturation, images can also be pre-processed to improve rotoscoping too, and to help the roto brush plugin.
When I'm doing roto on any scene with camera movement I use a 3-step inverse camera process- firstly I motion stabilise the shot, then I work on the stabilised shot, then I put the original camera movement back in. I call it 'inverse camera' but it's also called 'reverse stabilisation' and it's demonstrated in a much more interesting way by Andrew Kramer:
If I'm working with people who are new to rotoscoping then I get them to watch Andrew's tutorial first, because working on stabilised footage can make the roto process so much easier."
Scott Squires has some tips on Rotoscoping Hair at a new Focal Press website, Postopolis. By the way, if you roto and key hair, sometimes it's faster to duplicate the keyed hair to make it more distinct rather than brutishly mess with controls.
So far there's no overall review of roto in CS5 (with significant additions of the Rotobrush and Mocha Shape), but Mark Christiansen's new AE book on VFX & CS5 is out on Monday. For now you can find more on the basics of rotoscoping in the roundup Rotoscoping tips and other AEP posts tagged roto, in Rotoscoping introduction and resources in AE Help, and at Scott's blog Effects Corner. See also Scott Stewart on cutting the perfect matte and Stu Mashwitz on the basic of procedural matte extraction, both from the out-of-print Masters of Visual Effects:
Update: Premiumbeat has something similar, taking "a look at the process of stabilizing footage using Adobe After Effects built in Stabilization feature. We will also look at how to apply a graphical element to the stabilized footage and then how to reverse the stabilization, to give a motion tracked effect to the graphics."
'Even better, you can simply copy that shape from Mocha AE and paste it into After Effects as a mask. Read that again, because this may be the biggest feature in After Effects CS5 that almost no one has discovered: Mocha AE can track a shape around an object over time, and you can copy that shape and paste it into a layer's Mask Shape, with keyframe data, right in the Timeline.
I know what you're thinking: "Weren't you just telling me about this other great automated roto tool?" The point is that no tool does everything. Roto Brush data cannot be converted to Mask Shape keyframes, and masks are embedded into so many operations in After Effects and its plug-ins that you could find yourself using Mocha AE as much as Roto Brush to create roto masks.'
Chris & Trish Meyer are hosting a webinar on After Effects CS5 next Tuesday July 20th, demonstrating the new Roto Brush tool, mocha shape, Adobe Repoussé, Digieffects FreeForm, Color Look-up Tables, RED R3D settings, the new Per-Character 3D align option, Divide and Subtract modes, and more.
They "will also be joined by Dave Simons - one of the original creators of After Effects, as well as one of the architects behind Roto Brush - to answer your questions about this important new tool."
"I demonstrate some techniques for removing footage from a background. We look at luma mattes, masking and the Roto Brush tool. If you’ve watched the Roto Brush tutorial, this time I demonstrate how to make better corrective strokes."
For more on rotoscoping in After Effects & beyond, click on the tag roto.
Andrew Kramer and Video Copilot are back with a new After Effects tutorial video tutorial, 105. 3D Ledge, which integrates 3D with live action footage using 2D tracking: "...we will be keying, tracking, roto-scoping, exporting, integrating, color correcting and a lot more. This 47-minute tutorial starts out in After Effects and covers generating the 3D building in 3D Max & Cinema 4D. No match-moving or 3D tracking required everything is done with the 2D tracker in AE. I’ve even included the 3D building for everyone to use.
You can even skip the 3D programs and build a sweet building in After Effects alone with the 3D City Tutorial."
Roto tools in After Effects CS5 could help speed "dimensional workflow" for 3D stereosopic projects with faster ways to change depth of field. Ok, that's not just for 3D.
Other discussions of 3D in CS5 and in AE were noted previously in 3D, Cineform, and CS5. And here's some fun via Tim Sassoon from a recent thread on the AE-List on 3D and its hype, 2D Theatre by Hungry Beast -- and something more like the future via the Twittersphere:
Update: Andrew Murchie has launched a four-part series of After Effects tutorials showing how to convert 2D footage to 3D. Each one focuses on a different technique with an increasing level of complexity. 2d to 3d After Effects tutorial, the first tutorial, covers a simple channel offset technique that will get you converting 2d to 3d.
These overviews are worth looking at for many observations, on mocha and RotoBrush for example where "divide & conquer" (or "Combining") is recommended. Here are some samples on the Roto Brush and on Mocha 2:
Lynda.com has several Youtube CS5 teasers for (so far) free CS5 training. Chris Meyer has some free now on Lynda.com: Working with mocha, Repoussé in Photoshop CS5, Repoussé in After Effects CS5.
Mark Christiansen also has some AE CS5 training up on Lynda.com (Roto Brush, Refine Matte, color/modes), with more promised.