
AFTER EFFECTS CS3
User Guide
261
Compound masks that result when different modes are applied to the circle mask. The masks in this illustration have different Mask Opacity
values.
A. Original masks B. None C. Add D. Subtract E. Intersect F. Lighten G. Darken H. Difference
None The mask has no direct influence on the alpha channel of the layer. This option is useful when you are only
usingthemask’spathforaneffectsuchasStrokeorFill,orifyouareusingthemaskpathasthebasisforashapepath.
Add Themaskisaddedtothemasksaboveitinthestackingorder.Theinfluenceofthemaskiscumulativewiththe
masks above it.
Subtract The influence of the mask is subtracted from the masks above it. This option is useful when you want to
create the appearance of a hole in the center of another mask.
Intersect The mask is added to the masks above it in the stacking order. In areas where the mask overlaps the masks
aboveit,theinfluenceofthemaskiscumulativewiththemasksaboveit.Inareaswherethemaskdoesnotoverlap
with the masks above it, the result is complete opacity.
Lighten The mask is added to the masks above it in the stacking order. Where multiple masks intersect, the highest
transparency value is used.
Darken The mask is added to the masks above it in the stacking order. Where multiple masks intersect, the lowest
transparency value is used.
A B
C D
E
F
GH
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