Keying Effects - Adobe 65008009 - After Effects CS4 Using Manual

Last updated 12/21/2009
Other methods of animating paint strokes and text are also available. For example, you can animate text by using the
type tools and text animators, and you can animate a paint stroke applied with a paint tool. Paint strokes can have a
Write-on Duration setting, which you can use to create similar results as with the Write-on effect. You can also
animate shape paths for a similar result with the Trim Paths operation. (See
and edit paint strokes" on page 304, and
page 333.)
The position of the brush. Animate this property to create a stroke.
Brush Position
The duration, in seconds, of each brush mark. If this value is 0, the brush mark has unlimited
Stroke Length (secs)
duration. Use a single, constant, nonzero value to create a snakelike movement of the stroke. Animate this value to
make the stroke expand and contract.
The time interval, in seconds, between brush marks. Smaller values produce smoother paint
Brush Spacing (secs)
strokes but take more time to render.
Paint Time Properties and Brush Time Properties
to each brush mark or to the entire stroke. Choose None to apply values at each time to all brush marks in the stroke.
Choose a property name for each brush mark to retain the value for that property at the time that the brush mark was
drawn. For example, if you choose Color, then each brush mark keeps the color specified by the Color value at the time
that the mark was drawn.
How the paint stroke interacts with the original image:
Paint Style
• Paint stroke appears over original image.
On Original Image
• Paint stroke appears over transparency; the original image doesn't appear.
On Transparent
•
Reveal Original Image

Keying effects

After Effects includes several built-in keying effects, as well as the Academy Award–winning Keylight effect, which
excels at professional-quality color keying. For information on the Keylight effect, see its documentation in the folder
in which the Keylight plug-in is installed. (See "Plug-ins" on page 641.)
Note: Though the color keying effects built into After Effects can be useful for some purposes, you should try keying with
Keylight before attempting to use these built-in keying effects. Some keying effects—such as the Color Key effect and the
Luma Key effect—have been superseded by more modern effects like Keylight.
For information about keying in general, including links to tutorials and other resources, see
resources" on page 383.
Color Difference Key effect
Note: Though the color keying effects built into After Effects can be useful for some purposes, you should try keying with
Keylight before attempting to use these built-in keying effects. Some keying effects have been superseded by more modern
effects like Keylight.
For information about keying in general, including links to tutorials and other resources, see
resources" on page 383.
"Shape attributes, paint operations, and path operations for shape
Specifies whether paint properties and brush properties are applied
The original image is revealed by the paint stroke.
USING AFTER EFFECTS CS4
Effects and animation presets
"Animating text" on page 354,
"Keying introduction and
"Keying introduction and
505
"Animate
layers" on