Adobe After Effects CS4 Manual de usuario descargar pdf (Pagina 302)

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Last updated 12/21/2009

Chapter 10: Drawing, painting, and paths

Paint tools: Brush, Clone Stamp, and Eraser

Paint tools and paint strokes

The Brush tool , Clone Stamp tool , and Eraser tool are all paint tools. You use each in the Layer panel to

apply paint strokes to a layer. Each paint tool applies brush marks that modify the color or transparency of an area of

a layer without modifying the layer source.

Each paint stroke has its own duration bar, Stroke Options properties, and Transform properties, which you can see

and modify in the Timeline panel. Each paint stroke is, by default, named for the tool that created it, with a number

that indicates the order in which it was drawn.

At any time after you draw a paint stroke, you can modify and animate each of its properties using the same techniques

that you use to modify the properties and duration of a layer. You can copy paint stroke path properties to and from

properties for mask paths, shape layer paths, and motion paths. For even more power and flexibility, you can link these

properties using expressions. (See

“Creating shapes and masks” on page 312 and “Add, edit, and remove expressions”

on page 647.)

Important: To specify settings for a paint stroke before you apply it, use the Paint and Brushes panels. To change and

animate properties for a paint stroke after you’ve applied it, work with properties of the stroke in the Timeline panel.

Individual brush marks are distributed along each paint stroke—though the marks may appear to merge together to

form a continuous stroke with the default settings. Brush settings for each brush in the Brushes panel determine the

shape, spacing, and other properties of brush marks; you can also modify these Stroke Options properties for each

stroke in the Timeline panel.

In After Effects, paint strokes are vector objects, which means that they can be scaled up without loss of quality. Paint

strokes in some applications, such as Photoshop, are raster objects. (See

“About vector graphics and raster images” on

page 306.)

Groups of paint strokes appear in the Timeline panel as instances of the Paint effect. Each instance of the Paint effect

has a Paint On Transparent option. If you select this option, the layer source image and all effects that precede this

instance of the Paint effect in the effect stacking order are ignored; the paint strokes are applied on a transparent layer.

For some painting, drawing, cloning, and retouching tasks, you may want to take advantage of the sophisticated paint

tools provided by Adobe Photoshop. See “Working with Photoshop and After Effects” on page 38.

For a video tutorial on using the paint tools, visit the Adobe website at www.adobe.com/go/vid0223.

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Adobe After Effects CS4 Manual de usuario Pagina 302

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