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Learn how to smooth handheld footage, choose which objects in a scene get stabilized, and even reverse a stabilization to track an object in an unstable scene using the Warp Stabilizer VFX. Show If you shoot footage using a handheld camera, you will probably end up with shaky shots. Unless this look is intentional, you’ll want to stabilize your shots to eliminate unwanted motion. Warp Stabilizer VFX in Adobe After Effects automatically removes extraneous jitters. When played back, the motion appears smooth because the layer itself is scaled and moves incrementally to offset the unwanted movement. (The Warp Stabilizer VFX effect replaces the Warp Stabilizer effect available in previous versions of After Effects.) In this excerpt from Adobe After Effects Classroom in a Book, published by Adobe Press, you will apply Warp Stabilizer VFX to a shaky clip to see how the stabilization effect works. About bicubic scalingIn this tutorial, you will scale the video sample. When you scale video footage or an image to a larger size, After Effects must sample data to add information where none existed before. You can choose which sampling method After Effects uses when scaling a layer. For details, see the video, Set scaling quality using bicubic sampling. In previous versions, After Effects has used only bilinear sampling. Bicubic sampling, new in After Effects, uses a more complex algorithm that typically provides better results when color transitions are more gradual, as in nearly all real-world photographic images. Bilinear scaling may be a better option for sharp-edged graphics. To choose a sampling method for a layer, select the layer, and choose Layer > Quality > Bicubic or Bilinear. Bicubic and bilinear sampling are available only for layers that are set to Best quality. (To change a layer’s quality setting to Best, choose Layer > Quality > Best.) Setting up the projectAs you start After Effects, restore the default application settings for After Effects:
Importing the footageYou need to import one footage item to start this project. Download the sample tutorial files that accompany this tutorial to follow along.
Figure 1. Importing the sample flowers.mov file into the project Creating the compositionYou’ll start by creating the composition.
Applying Warp Stabilizer VFXWarp Stabilizer VFX starts analyzing footage as soon as you apply it. Stabilization is a background process, so you can work on other compositions while it finishes. How long it takes depends on your system. After Effects displays a blue banner while it analyzes the footage and an orange banner while it applies stabilization (see Figure 2). Figure 2. Analyzing and stabilizing the footage
The clip is still shaky, but it’s smoother than it was initially. Warp Stabilizer VFX moved and repositioned the footage. To see how it applied changes, view the effects in the Effect Controls panel. For example, the clip’s borders were scaled up (to about 103%) to hide black gaps that occur when the image is repositioned in the stabilization process. You’ll adjust the settings that Warp Stabilizer VFX uses. Adjusting the Warp Stabilizer VFX SettingsYou’ll change the settings in the Effect Controls panel to make the shot smoother.
Figure 3. Adjusting the stabilization settings and seeing the results
Figure 4. Choosing No Motion from the Result menu in the Effect Controls panel With this setting, Warp Stabilizer VFX attempts to lock the camera in position. This requires even more scaling. When No Motion is selected, the Smoothness option is dimmed.
Now the camera stays in position, so that the movement you notice is the rustling of the flowers in the wind, not the shakiness of the camera. In order to achieve this effect, Warp Stabilizer VFX had to scale the clip to 112.4% of its original size. Fine-tuning the resultsThe default analysis works well most of the time, but sometimes you may need to massage the end results even further. In this project, the clip skews subtly in a few places, most noticeably at about the five-second mark. Casual viewers may not notice the problem, but a keen producer will. You’ll change the method that Warp Stabilizer VFX uses to remove the skew.
Note: Scaling a video layer up degrades the image. A good rule of thumb is to keep the Additional Scale value below 115% if possible. Figure 5. Increasing the scale in the Effect Controls panel
Open Stabilize.mov included in the sample tutorial files to see how the final, stabilized footage should look. As you have discovered, stabilizing a shot is not without its drawbacks. To compensate for the movement or rotation data applied to the layer, the frames must be scaled, which could ultimately degrade the footage. If you really need to use the shot in your production, this may be the best compromise. Warp Stabilizer VFX settingsThis is just a summary of the Warp Stabilizer VFX settings to help you get started.
Tip: You can use Warp Stabilizer VFX advanced settings to achieve more complex effects, too. To learn more, see Adobe After Effects Visual Effects and Compositing Studio Techniques, available from Adobe Press. |