Adobe After Effects CS3 - Manual (Page 485)

AFTER EFFECTS CS3
User Guide
480
Composite Paint options
A. In Original (default setting), before painting The imported image is visible.
B. In Original, with paint stroke The paint strokes appear above the original image.
C. In Original, with paint stroke and erasure stroke An erasure stroke removes underlying portions of both the paint
stroke and the original image.
D. Only The original image on the layer doesn’t appear in the working view; only paint strokes are shown. Erasures
remove only paint, not the original image.
E. Over Original The original image is visible in the working view, similar to the In Original option. Painting and
erasing occur as with the Only option: Erasing removes pixels from underlying paint strokes but doesn’t alter the
original image.
F. Under Original The layer image is visible in the working view. Painting doesn’t 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 isn’t 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 don’t 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.
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