User Guide

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ADOBE AFTER EFFECTS 5.0
User Guide
F. Under Original The layer image is visible in the working view. Painting does not alter
the original image; it affects only areas of the layer that are outside the original image.
Erasures remove only paint pixels, not the original image.
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.
UG.book Page 429 Wednesday, February 21, 2001 12:05 PM