Write-On Effect; Mid-Point Opacity; Mid-Point Position - Adobe AFTER EFFECTS 7.0 Manual

ADOBE AFTER EFFECTS 7.0 462
User Guide
Specifies the opacity of the midpoint of the stroke. This works in terms of relative opacity, not

Mid-point Opacity

absolute opacity. Setting this to 0 makes the change in opacity smooth from the start point to the end point, as if there
were no midpoint at all.
Specifies the location of the midpoint within a segment: Lower values move the midpoint closer

Mid-point Position

to the beginning; higher values move the midpoint closer to the end. Use this control to move the midpoint opacity
from the center of the stroke.

Write-on effect

The Write-on effect animates strokes on a layer. For example, you can simulate the writing of cursive text or create
snakelike movement for a stroke. Using the Write-on effect, you can animate the brush size, color, hardness, and
opacity of a stroke.
This effect works with 8-bpc color.
Animating the Write-on effect
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. (See "About text animation" on page 295.)
Adjust the following controls for the Write-on effect:
Specifies where the stroke begins.
Brush Position
Specify the size and appearance of the stroke.
Color, Brush Size, Brush Hardness, and Brush Opacity
Specifies the length, in seconds, of the stroke at any moment. If this value is 0, the stroke has
Stroke Length
unlimited length. Use a single stroke length (not 0) for all keyframes to create a snakelike movement of the stroke
across the layer. Change the stroke length at keyframes to make the length of the stroke expand and contract as it is
drawn.
Specifies the time interval, in seconds, between dabs of color as the stroke is drawn. Smaller values
Brush Spacing
produce smoother paint strokes but take more time to render.
Specifies whether paint properties (color and opacity) are applied to each stroke segment or
Paint Time Properties
to the entire stroke. None applies color and opacity specified at each keyframe to the entire stroke. Color applies the
color specified at a keyframe to the stroke starting at that keyframe until it is changed at a later keyframe. The opacity
specified at each keyframe is applied to the entire stroke. Opacity applies the opacity specified at a keyframe to the
stroke starting at that keyframe until it is changed at a later keyframe. The color specified at each keyframe is applied
to the entire stroke.
Specifies whether brush properties (size and hardness) are applied to each stroke segment or
Brush Time Properties
to the entire stroke. None applies the brush size and hardness specified at each keyframe to the entire stroke. Size
applies the brush size specified at a keyframe to the stroke starting at that keyframe until it is changed at a later
keyframe. The hardness specified at each keyframe is applied to the entire stroke. Hardness applies the hardness
specified at a keyframe to the stroke starting at that keyframe until it is changed at a later keyframe. The size specified
at each keyframe is applied to the entire stroke. Size & Hardness applies both the brush size and hardness specified
at a keyframe to the stroke starting at that keyframe until they are changed at a later keyframe.