Adobe After Effects CS3 Manuale Utente Scaricare il pdf (Pagina 538)

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AFTER EFFECTS CS3

User Guide

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Time Offset The relative time in the comparison layer, in seconds, where the layers are compared. If this control is

set to 0.00, the comparison occurs at the current time. To compare the effect layer to a point 3 seconds into the

comparison layer, for example, change the Time Offset value to 3. When you select the underlined offset value, you

can enter the specific frame offset value in the format frames/frame rate. After Effects automatically calculates the

value. For example, enter 3/30 to offset three frames forward in a 30-fps composition. The calculated value is 0.1, or

10% of the total time.

Contrast Adjusts the comparison result. This control can be especially helpful in fine-tuning color corrections.

Absolute Difference Displays the result of the comparison as an absolute value. Any area of the comparison layer

that isn’t different from the effect layer is represented by black, and any amount of difference is represented as

brighter than black. If this option is unselected, compared areas with no difference are represented as gray.

Alpha Channel Specifies how the alpha channel is calculated.

• Original Uses the effect layer’s alpha channel.

• Target Uses the target layer’s alpha channel.

• Blend Blends the effect and target layers’ alpha channels.

• Max Uses the most opaque of the original source and Target layers’ alpha channels.

• Full On Sets the alpha channel to completely opaque.

• Lightness Of Result Uses the lightness of the RGB difference as alpha.

• Max Of Result Uses the highest values of the RGB difference as alpha.

• Alpha Difference Calculates differences in the effect and target layers’ alpha channels the same way RGB

difference is calculated.

• Alpha Difference Only Calculates only the differences in the alpha channels. RGB is set to white.

Time Displacement effect

The Time Displacement effect distorts the image by shifting pixels across time, producing a wide variety of effects.

For example, the traditional slit-scan technique, which captures different stages of a moving image across time, can

be simulated using the Time Displacement effect.

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

Time Displacement effect

Like the Displacement Map effect, the Time Displacement effect uses a displacement map, but it bases the movement

of pixels in the layer on luminance values in the map. Pixels in the layer that correspond to bright areas in the

displacement map are replaced by pixels in the same position but at a specified number of seconds forward in time.

Likewise, pixels in the layer that correspond to dark areas in the displacement map are replaced by pixels at a

specified number of seconds backward in time. You can use any layer as a displacement map, though using a

grayscale image lets you more easily see brightness levels and predict how pixels will be displaced.

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Adobe After Effects CS3 Manuale Utente Pagina 538

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