To Adjust The Opacity Of A Mask; To Apply Motion Blur To A Mask - Adobe AFTER EFFECTS 7.0 Manual

A
C
Setting the Mask Feather property
A. Masked layer with 5-pixel feather B. Masked layer with 40-pixel feather C. Result with 5-pixel feather D. Result with 40-pixel feather
Mask feathering takes place only within the dimensions of the layer frame area. Therefore, a feathered mask shape
should always be slightly smaller than the layer area and should never move to the very edge of the layer. If a mask
feather extends beyond the layer area, the feathered edge ends abruptly.
You can adjust the feathering of a layer's mask by specifying precise values or by dragging in the Timeline panel.
Expand the desired layer and its Mask properties in the Timeline panel.
1
If you want to constrain the x and y values so that they are constrained to change proportionally, click the
2
Constrain Proportions switch
Do one of the following:
3
•
Drag the underlined value for Mask Feather.
•
Right-click (Windows) or Control-click (Mac OS) the underlined value for Mask Feather, and select Edit Value.
Specify an amount for horizontal or vertical feathering.
Note: You can apply only uniform feathers, that is, feathers that expand the mask horizontally and vertically, on layers
that have Continuously Rasterize enabled in the Timeline panel.

To adjust the opacity of a mask

Masks have an opacity property that you can use to adjust the transparency of any mask, or even to turn masks on
and off temporarily.
In the Timeline panel, expand the mask properties of the mask you want to adjust.
1
Drag the underlined value for Mask Opacity.
2

To apply motion blur to a mask

Motion blur creates a blur based on a mask's movement in the composition. You can apply motion blur to any one
of the individual masks on a layer.
B
D
next to the Mask Feather property so that the Constrain Proportions icon appears.
ADOBE AFTER EFFECTS 7.0
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User Guide