Mask Modes I

Every mask in After Effects has a mode. Select your layer and hit M on your keyboard to show masks. The Mask mode is visible in the switches column.

• The default mask mode is Add, it means the new mask combines with the previous mask on the layer.

• Masks work based on their placement in the timeline so the subtract will subtract the selected area from all masks above it.

• Intersect adds the mask to all masks above it but will only display the area at which all masks intersect.

• Difference adds a mask to all masks above it and displays all masked areas except the areas where masks intersect.

• Use None when using a mask-based effect. A mask set to None will not affect the transparency of a layer.