Lesson overview. 1How does After Effects import Photoshop files?

WORKING WITH MASKS

Laboratory work 7

Review answers

Review Questions

1 How does After Effects import Photoshop files?

2 What is the pick whip, and how do you use it?

3 What is a track matte, and how do you use it?

4 How do you remap time in After Effects?

1 When you import a layered Photoshop file into After Effects as a composition, After Effects preserves the layer order, transparency data, and layer styles from the source Photoshop document. It also preserves other features, such as adjustment layers and type. When you import a layered Photoshop file as a single footage item, however, After Effects flattens and merges the Photoshop layers into one image.

2 The pick whip creates expressions that link the values of one property or effect to another layer. The pick whip is also a way to create parenting relationships. To use the pick whip, simply drag the pick whip icon from one property to another.

3 When you want one layer to show through a hole in another layer, you can use a track matte. To create a track matte, you need two layers: one to act as a matte, and another to fill the hole in the matte. You can animate either the track matte layer or the fill layer. When you animate the track matte layer, you create a traveling matte.

4 There are several ways to remap time in After Effects. Time remapping lets you dynamically speed up, slow down, stop, or reverse footage. When remapping time, you can use the values in the time-remap graph in the Graph Editor to determine and control which frame of the movie plays at which point in time. When you enable time remapping for a layer, After Effects adds a Time Remap keyframe at the start and end points of the layer. By setting additional Time Remap keyframes, you can create complex motion effects. Every time you add a Time Remap keyframe, you create another point at which you can change the playback speed or direction.

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

􀁴 Create a mask using the Pen tool.

􀁴 Change a mask’s mode.

􀁴 Edit a mask shape by controlling vertices and direction handles.

􀁴 Feather a mask edge.

􀁴 Replace the contents of a mask shape.

􀁴 Adjust the position of a layer in 3D space to blend it with the rest of the shot.

􀁴 Create a reflection effect.

􀁴 Create a vignette.

􀁴 Use Auto Levels to correct the color of the shot.

This lesson will take approximately an hour to complete. Copy the Lesson07 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.

There will be times when you won’t need (or want) everything in the shot to be included in the fi nal composite. Use masks to control what appears.

Дата добавления: 2014-11-20