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Adjusting the edges of a mask


    To finely expand or contract all the edges of a mask, use the Mask Expansion property. This property value represents, in pixels, how far from the original mask edge you are expanding or contracting the adjusted edge.

To adjust the edges of the mask using Mask Expansion:

  1. In the Timeline window, expand the Mask properties of the layer you want to adjust.
  2. Drag the underlined value for Mask Expansion.