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Flash has many powerful masking effects that can add
interest to graphics. The best way to implement the
mask is to create a shape which will be used as the
mask on a seperate layer, which is placed above the
layer to which the mask will be applied to. In this
example I've placed a copy of the skull graphic on
the lowest layer. This graphic has a negative value
for its brightness, thus it is much darker than the
original graphic. The mask area is then applied to
the normal graphic, and wherever the mask appears
the area which the mask covers will appear. Everything
else will be from the lowest layer. The mask layer
can be easily animated using tweening. In this case
I have applied a motion tween, along with a shape
tween, so that the spotlight appears to become larger
as it moves over the graphic.
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