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After Effects Apprentice 12: Tracking and Keying
Illustration by John Hersey

Quizzler challenges


From:

After Effects Apprentice 12: Tracking and Keying

with Chris Meyer and Trish Meyer

Video: Quizzler challenges

Next we'd like to present you with some Quizzler challenges, the combined things you've learned in this lesson as well as things you've learned in previous After Effects Apprentice lessons. If you have access to the project files that came with this lesson open up the Quizzler folder and there you'll find compositions that are your starting points for these challenges as well as movies that show the final result. If you don't have access to the files you can just watch these challenges think about how you might solve these then compare your result stars. The first challenge involves this stabilization you did earlier in this lesson.
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  1. 9m 2s
    1. Welcome
      2m 38s
    2. The Tracker panel
      4m 24s
    3. Using the exercise files
      2m 0s
  2. 13m 25s
    1. Warp Stabilizer basics
      5m 59s
    2. Warp Stabilizer advanced parameters
      7m 26s
  3. 30m 6s
    1. Setting up a stabilization
      2m 57s
    2. Track points explained
      5m 48s
    3. Performing a track
      5m 11s
    4. Applying a stabilization
      2m 42s
    5. Cleaning up the results of a stabilization
      3m 0s
    6. Performing a motion track
      5m 57s
    7. Applying the results
      4m 31s
  4. 13m 48s
    1. The Radio Waves effect
      4m 16s
    2. Tracking the mountain
      5m 31s
    3. Compositing the effect
      4m 1s
  5. 24m 28s
    1. Perspective tracking overview
      2m 40s
    2. Tracking to a corner pin
      7m 1s
    3. Improving the composite
      5m 39s
    4. Tracking with mocha-AE
      9m 8s
  6. 31m 49s
    1. Tracking in 3D (new in CS6)
      4m 31s
    2. Creating 3D objects (new in CS6)
      5m 12s
    3. Hanging a poster (new in CS6)
      8m 8s
    4. Adding text (new in CS6)
      5m 33s
    5. Using shadow catchers (new in CS6)
      8m 25s
  7. 16m 46s
    1. Tracking dots
      5m 43s
    2. Dealing with obscuration
      5m 12s
    3. Cleaning up the stabilization
      5m 51s
  8. 12m 40s
    1. Basic keying
      7m 20s
    2. Refining the key
      5m 20s
  9. 13m 32s
    1. Quizzler challenges
      3m 35s
    2. Quizzler #1 solution: Stabilization plus masking
      2m 58s
    3. Quizzler #2 solution: Stabilization plus tracking
      2m 50s
    4. Quizzler #3 solution: Copying a camera's motion
      4m 9s
  10. 12m 28s
    1. Tracking for multiple effect points
      4m 44s
    2. Converting to ray-traced 3D (new in CS6)
      7m 44s
  11. 23m 59s
    1. Legacy tracker advice
      8m 14s
    2. Tracking interlaced sources
      5m 59s
    3. Using garbage masks for keying
      4m 51s
    4. Using the Rolling Shutter Repair feature (new in CS6)
      4m 55s

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After Effects Apprentice 12: Tracking and Keying
3h 22m Intermediate Nov 23, 2011 Updated Dec 12, 2012

Viewers: in countries Watching now:

Explore how to use the motion tracker and stabilizer built into After Effects and shows how to handle a variety of shots. Author Chris Meyer leads a quick tour of the third-party software mocha and demonstrates the workflow for The Foundry's KEYLIGHT, both bundled with After Effects. The course also covers tracking a greenscreen shot with a handheld camera and replacing its background.

The After Effects Apprentice videos on lynda.com were created by Trish and Chris Meyer and are designed to be used on their own and as a companion to their book After Effects Apprentice. We are honored to host these tutorials in the lynda.com Online Training Library®.

Topics include:
  • Understanding motion stabilization and keying
  • Performing a track
  • Applying tracking to effects
  • Keying with KEYLIGHT
  • Replacing images
  • Improving the composite
  • Garbage masking
  • Dealing with interlaced footage
Subjects:
Video Motion Graphics Visual Effects
Software:
After Effects
Authors:
Chris Meyer Trish Meyer

Quizzler challenges

Next we'd like to present you with some Quizzler challenges, the combined things you've learned in this lesson as well as things you've learned in previous After Effects Apprentice lessons. If you have access to the project files that came with this lesson open up the Quizzler folder and there you'll find compositions that are your starting points for these challenges as well as movies that show the final result. If you don't have access to the files you can just watch these challenges think about how you might solve these then compare your result stars. The first challenge involves this stabilization you did earlier in this lesson.

In this case say you not only want to stabilize this shot, but also mask it down to a banner to use as a graphic element in an overall composite, I'll select the layer, so that you can also see the Mask Outline, I'll RAM Preview and you'll see we have a small problem here. Even though we've stabilized the video portion of this shot our Mask Outline is now bouncing around. Why is that happening? Well this is the rendering order inside After Effects, I going to twirl up the Motion Trackers, and you may remember that a mask in After Effects is rendered before any transformations are applied.

The Motion Tracker works by taking the result of its tracking data and applying it to the anchor point of this clip to make it appear to be stable, but in reality it's animating that anchor point around. So how would you come with an end result, where both the shot is stable, but also the Mask Outline is stable as well? Think about that for a moment. Take your best shot using the composition provided here and compare your results with ours. The second challenge is very similar. Again, here's the wildebeest that you saw earlier and you remember that we had some fun attaching text as a sort of thought bubble to follow the second wildebeest inside this shot.

However, the original shot does have this bit of tripod shakyness in it, how would you craft this? This is not only the text followed the second wildebeest which is our tracking shot, but also that the overall shot was stable, which is a completely different type of track. How would you execute both a stabilization and a track with the same clip? Think about that. Now we'll show you the solution in a later movie.

Lastly here is that tricky tracking shot you worked on in order to replace the background. Now we have a nice stable background because this is a still image and you stabilize the video so that its motion would match up with the new stable background, but this shot is missing a bit of excitement and that is a problem of locked down cameras or still image backgrounds. You may remember that the original shot actually had an animated camera. Someone was walking handheld after the actors and recording the action.

So my challenge to you is, rather than stabilize this shot how would you maintain this camera's motion as part of your composite between the green screened actors and the new still image background? Yes, it is possible. Here is the solution, where you see the background rotating, scaling and moving along with the original camera shot which makes it a look a lot more realistic by the way, doesn't it? How would you go about creating this particular result? Okay, those are your challenges, get to work come back and compare your result to ours.

Find answers to the most frequently asked questions about After Effects Apprentice 12: Tracking and Keying.


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Q: This course was updated on 12/12/2012. What changed?
A: We added new chapters on the Warp Stabilizer and the exciting new 3D Camera Tracker, and new movies on the Tracker panel, converting to ray-traced 3D, and rolling shutter repair, all new features introduced in After Effects CS6. In addition, there are new sets of exercise files designed for After Effects CS5.5 and After Effects CS6 and a companion movie that shows our premium subscribers how to use the exercise files.
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