Adobe AFTER EFFECTS CS3 PROFESSIONAL User Manual page 483

AFTER EFFECTS CS3 477
User Guide
A B C
E F
D
G H I
J K L
Composite Paint options
The imported image is visible.
A. In Original (default setting), before painting
The paint strokes appear above the original image.
B. In Original, with paint stroke
An erasure stroke removes underlying portions of both the paint
C. In Original, with paint stroke and erasure stroke
stroke and the original image.
The original image on the layer doesn't appear in the working view; only paint strokes are shown. Erasures
D. Only
remove only paint, not the original image.
The original image is visible in the working view, similar to the In Original option. Painting and
E. Over Original
erasing occur as with the Only option: Erasing removes pixels from underlying paint strokes but doesn't alter the
original image.
The layer image is visible in the working view. Painting doesn't alter the original image; it affects
F. Under Original
only areas of the layer that are outside the original image. Erasures remove only paint pixels, not the original image.
The original image isn't visible in the working view. Paint strokes are visible. Painting affects
G. Track Original Matte
only the area within the original image alpha channel (that is, paint applied within the original circle area). Erasures
remove only existing paint pixels.
The original image is visible in the working view. Otherwise, Vector Paint strokes
H. Track Original Matte Visible
behave exactly as with Track Original Matte, so erasures don't affect the original image.
Before you paint, nothing is visible in working view. Paint strokes affect only the matte, revealing the
I. As Matte
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.