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Create a rectangular or elliptical mask numerically

  1. Select a layer in the Composition panel, or display a layer in the Layer panel.
  2. Choose Layer > Mask > New Mask. A new mask appears in the Composition or Layer panel with its handles at the outer edges of the frame.
  3. Choose Layer > Mask > Mask Shape.
  4. Select Rectangle or Ellipse, and specify the size and location of the mask’s bounding box.

 

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