Adobe AFTER EFFECTS 5.5 Help Manual page 340

Adobe After Effects Help
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G. Track Original Matte The original image is not visible in the working view. Paint
strokes are visible. Painting affects only the area within the original image alpha channel
(that is, paint applied within the original circle area). Erasures remove only existing paint
pixels.
H. Track Original Matte Visible The original image is visible in the working view.
Otherwise, Vector Paint strokes behave exactly as with Track Original Matte, so erasures do
not affect the original image.
I. As Matte Before you paint, nothing is visible in working view. Paint strokes affect only
the matte, revealing the underlying original image. Erasures add back areas of opacity, so
that they appear to erase the underlying image again. Both types of strokes are restricted
to the area of the original alpha channel.
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 do not 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 window,
not by the color of paint.
L. Under Original Alpha Only The original image appears within its alpha channel in
working view. Strokes do not affect the original image alpha channel, only areas outside of
it. Painting adds areas of opacity; erasing restores transparency 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.
Playing back your painting (PB only)
Use the Playback Mode pop-up menu in the Effect Controls window to specify when and
how quickly your strokes appear in your composition. When you draw strokes, Vector Paint
records information for the stroke start time and the drawing time of each stroke (in real
time). The Playback Mode you select determines when a stroke starts and for how long it
appears. You can set the speed at which the strokes play back using Playback Speed.
Play back your strokes using the Spacebar or RAM Preview, or by viewing the results of a
rendered Composition.
Note: Regardless of how you record your strokes and which Playback Mode you select
when recording, you can always switch to another Playback Mode at any time.
While the Playback Mode chosen affects what you see during playback, it also determines
what you see while you are drawing strokes. Onion Skin mode, for example, is used
primarily while drawing strokes, and then another mode is selected before rendering.
Important: Notice the position of the Time Marker when you begin drawing strokes. This
position affects the appearance of strokes in all modes except All Strokes.
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