Adobe After Effects CS3 Manuel d'utilisateur télécharger pdf (Page 486)

AFTER EFFECTS CS3

User Guide

481

J. As Inverse Matte Before you paint, the original image is visible in the working view. Painting affects only areas

within the original image alpha channel. Paint strokes block (rather than reveal) the original image, appearing to

erase the original image. Erasures remove only painting strokes; that is, they re-reveal the underlying image within

the alpha channel.

K. In Original Alpha Only The original image appears within its alpha channel in working view. Strokes affect the

alpha channel itself. Painting adds areas of opacity. Erasures add areas of transparency.

Note: You don’t need to switch colors when you paint in the alpha channel, even if you paint with gray. The changes to

the opacity of the painted area are determined by the values shown for Opacity and Feather under Brush Settings in the

Effect Controls panel, not by the color of paint.

L. Under Original Alpha Only The original image appears within its alpha channel in working view. Strokes don’t

affect the original image alpha channel, only areas outside of it. Painting adds areas of opacity; erasing restores trans-

parency to painted areas only.

Note: The difference between using Under Original and Under Original Alpha Only is that in the latter, strokes affect

only the alpha channel; RGB is unchanged.

Select Vector Paint preferences

UsetheVectorPaintPreferencesdialogboxtocustomizethewayyouviewyourworkinVectorPaint.Unlikemost

other effects, the options you select as Vector Paint preferences apply to all your Vector Paint work, both on the

current layer and on other layers. Your current preferences are also used for subsequent sessions of Vector Paint.

1 Select Vector Paint in the Effect Controls panel and open the Vector Paint Preferences dialog box in any of the

following ways:

• Click the menu button in the Vector Paint toolbar in the Composition panel, and choose Options.

• Right-click (Windows) or Control-click (Mac OS) anywhere in the Composition panel, and choose Options.

• In the Effect Controls panel, click Options to Vector Paint.

2 Choose the appropriate options.

Note: Better Preview While Drawing is temporarily disabled in low-memory situations, and Draft quality is used

instead. Also, if the preview doesn’t draw correctly, you may have an incompatible graphics card.

Perspective effects

3D Glasses effect

The3DGlasseseffectcreatesasingle3Dimagebycombiningaleftandright3Dview.Youcanuseimagesfrom3D

programs or stereoscopic cameras as sources for each view.

The method you use to create the combined images dictates how you view them. For example, you can use 3D

Glasses to create an anaglyphic image, which is an image containing two slightly different perspectives of the same

subject that are tinted contrasting colors and superimposed on each other. To create an anaglyphic image, first

combine views and tint each one a different color. Then, use 3D glasses that have either red and green lenses or red

and blue lenses to view the resulting image stereoscopically.

This effect works with 8-bpc color.

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Adobe After Effects CS3 Manuel d'utilisateur Page 486