Adobe After Effects CS3 Manual de usuario descargar pdf (Pagina 536)

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AFTER EFFECTS CS3

User Guide

531

Time effects

Echo effect

The Echo effect combines frames from different times in a layer. The Echo effect has a variety of uses, from a simple

visual echo to streaking and smearing effects. The results of this effect are visible only if there is change across time

in the layer, such as motion.

Note: A layer’s masks and any previously applied effects are ignored by the Echo effect. To echo the frames of a layer with

its masks and effects, precompose the layer before applying the Echo effect.

This effect works with 8-bpc, 16-bpc, and 32-bpc color.

Echo effect

David Van Brink provides a blog post and sample project that show how to use the Echo effect, the Particle

Playground effect, and the loopOut expression to animate a swarm of stylized swimming bacteria:

www.adobe.com/go/learn_ae_ominosalmonella.

Echo Time (seconds) The time, in seconds, between echoes. Negative values create echoes from previous frames;

positive values create echoes from upcoming frames.

Number of Echoes The number of echoes. For example, if the value is 2, the result is a combination of three frames:

the current time, the current time + Echo Time, and the current time + (2 * Echo Time).

Starting Intensity The opacity of the first image in the echo sequence.

Decay Theratiooftheopacityofanechototheopacityoftheechoprecedingitintheechosequence.Forexample,

if Decay is 0.5, then the opacity of the first echo is half of the Starting Intensity; the second echo is half of that, or one

quarter of the Starting Intensity.

Echo Operator The blending operation used to combine the echoes.

• Add Combines the echoes by adding their pixel values. If the starting intensity is too high, this mode can quickly

overload and produce streaks of white.

• Maximum Combines the echoes by taking the maximum pixel values from all of the echoes.

• Minimum Combines the echoes by taking the minimum pixel values from all of the echoes.

• Screen Emulates combining the echoes by sandwiching them optically. This mode is similar to Add, but it won’t

overload as quickly.

• Composite In Back Causes the image from the current time to appear in back, with each echo appearing succes-

sively farther forward in the composite.

• Composite In Front Causes the image from the current time to appear in front, with each echo appearing succes-

sively farther back in the composite.

• Blend Averages the echoes.

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Adobe After Effects CS3 Manual de usuario Pagina 536

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