Lesson overview. Rendering and outputting

RENDERING AND OUTPUTTING

Laboratory work 14

Review answers

Review Questions

1 What is motion stabilization, and when do you need to use it?

2 Why might drifting occur when you’re tracking an image?

3 What is the birth rate in a particle effect?

4 What does the Timewarp effect do?

1 Shooting footage using a handheld camera typically results in shaky shots. Unless this look is intentional, you will want to stabilize the shots to eliminate unwanted motion. Motion stabilization in After Effects works by analyzing the movement and rotation of the target layer, and then applying the opposite values to the anchor point and rotation of that layer. When played back, the motion appears smooth because the layer itself moves incrementally to offset the unwanted motion.

2 Drifting occurs when the feature region loses the feature that’s being tracked. As an

2 Drifting occurs when the feature region loses the feature that’s being tracked. As an image moves in a shot, the lighting, surrounding objects, and angle of the object can change, making a once-distinct feature unidentifiable at the subpixel level. Even with careful planning and practice, the feature region often drifts away from the desired feature. Readjusting the feature and search regions, changing the tracking options, and trying again are a standard part of digital tracking.

3 The birth rate in a particle effect determines how often new particles are created.

4 The Timewarp effect gives you precise control over a wide range of parameters to change the playback speed of a layer, including interpolation methods, motion blur, and source cropping to eliminate unwanted artifacts.

In this lesson, you’ll learn how to do the following:

􀁴 Create render-settings templates.

􀁴 Create output-module templates.

􀁴 Process multiple output modules.

􀁴 Select the appropriate compressor for your delivery format.

􀁴 Use pixel aspect ratio correction.

􀁴 Output the final animation for NTSC broadcast video.

􀁴 Produce a test version of a composition.

􀁴 Render and output a web version of the final animation.

The total amount of time required to complete this lesson depends in part on the speed of your processor and on the amount of RAM available for rendering. The amount of hands-on time required is less than an hour. Copy the Lesson14 folder into the Lessons folder that you created on your hard drive for these projects (or create it now), if you haven’t already done so. As you work on this lesson, you’ll preserve the start files. If you need to restore the start files, copy them from the Adobe After Effects CS5 Classroom in a Book DVD.

The success of any project depends on your ability to deliver it in the format you need, whether it’s for the web or broadcast output. Using Adobe After Eff ects, you can create timesaving templates, and then render and export a fi nal composition in a variety of formats and resolutions.

Дата добавления: 2014-11-20