Lesson overview

USING THE ROTO BRUSH TOOL

Laboratory work 9

Review answers

Review Questions

1 What’s the difference between the Puppet Pin tool and the Puppet Overlap tool?

2 When would you use the Puppet Starch tool?

3 How can you make your animation more fluid?

4 Describe two methods of animating pin positions.

1 The Puppet Pin tool creates Deform pins, which define the position of a portion of the image as the image is deformed. The Puppet Overlap tool creates Overlap pins, which determine which areas of an object remain in front when two areas overlap.

2 Use the Puppet Starch tool to add Starch pins to an area that you want to remain more rigid while other areas of the object are distorted.

3 To make your animation more fluid, you can use the Easy Ease feature or roving keyframes. Additionally, you can create smoother movement by increasing the number of triangles in the distortion mesh, but increasing the number of triangles alsoincreases the time it takes to render the animation.

4 You can manually animate pin positions by changing the value of the Position property for each pin in the Timeline panel. To animate pin positions more quickly, use thePuppet Sketch tool: With the Puppet Pin tool selected, press Ctrl or Command, anddrag a pin to record its movement.

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

􀁴 Extract a foreground object from the background using the Roto Brush tool.

􀁴 Correct the segmentation boundary across a span of frames.

􀁴 Touch up a matte using the Brush tool.

􀁴 Refine a matte’s edges.

􀁴 Freeze a frame across the remainder of a layer.

􀁴 Animate properties for creative effects.

This lesson will take approximately 90 minutes to complete. Copy the Lesson09 folder into the Lessons folder that you created on your hard drive for these projects (or create it now), if you haven’t already doneso. 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 new Roto Brush tool makes it much faster to separate a foreground object from a background across many frames. You can achieve professional results in a fraction of the time you’d spend with traditional rotoscoping.

Дата добавления: 2014-11-20